balmet.com

kses.php (63891B)

---

 <?php
 /**
  * kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes
  * Copyright (C) 2002, 2003, 2005  Ulf Harnhammar
  *
  * This program is free software and open source software; you can redistribute
  * it and/or modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of the License,
  * or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  * http://www.gnu.org/licenses/gpl.html
  *
  * [kses strips evil scripts!]
  *
  * Added wp_ prefix to avoid conflicts with existing kses users
  *
  * @version 0.2.2
  * @copyright (C) 2002, 2003, 2005
  * @author Ulf Harnhammar <http://advogato.org/person/metaur/>
  *
  * @package External
  * @subpackage KSES
  */
 
 /**
  * Specifies the default allowable HTML tags.
  *
  * Using `CUSTOM_TAGS` is not recommended and should be considered deprecated. The
  * {@see 'wp_kses_allowed_html'} filter is more powerful and supplies context.
  *
  * @see wp_kses_allowed_html()
  * @since 1.2.0
  *
  * @var array[]|false Array of default allowable HTML tags, or false to use the defaults.
  */
 if ( ! defined( 'CUSTOM_TAGS' ) ) {
 	define( 'CUSTOM_TAGS', false );
 }
 
 // Ensure that these variables are added to the global namespace
 // (e.g. if using namespaces / autoload in the current PHP environment).
 global $allowedposttags, $allowedtags, $allowedentitynames, $allowedxmlentitynames;
 
 if ( ! CUSTOM_TAGS ) {
 	/**
 	 * KSES global for default allowable HTML tags.
 	 *
 	 * Can be overridden with the `CUSTOM_TAGS` constant.
 	 *
 	 * @var array[] $allowedposttags Array of default allowable HTML tags.
 	 * @since 2.0.0
 	 */
 	$allowedposttags = array(
 		'address'    => array(),
 		'a'          => array(
 			'href'     => true,
 			'rel'      => true,
 			'rev'      => true,
 			'name'     => true,
 			'target'   => true,
 			'download' => array(
 				'valueless' => 'y',
 			),
 		),
 		'abbr'       => array(),
 		'acronym'    => array(),
 		'area'       => array(
 			'alt'    => true,
 			'coords' => true,
 			'href'   => true,
 			'nohref' => true,
 			'shape'  => true,
 			'target' => true,
 		),
 		'article'    => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'aside'      => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'audio'      => array(
 			'autoplay' => true,
 			'controls' => true,
 			'loop'     => true,
 			'muted'    => true,
 			'preload'  => true,
 			'src'      => true,
 		),
 		'b'          => array(),
 		'bdo'        => array(
 			'dir' => true,
 		),
 		'big'        => array(),
 		'blockquote' => array(
 			'cite'     => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'br'         => array(),
 		'button'     => array(
 			'disabled' => true,
 			'name'     => true,
 			'type'     => true,
 			'value'    => true,
 		),
 		'caption'    => array(
 			'align' => true,
 		),
 		'cite'       => array(
 			'dir'  => true,
 			'lang' => true,
 		),
 		'code'       => array(),
 		'col'        => array(
 			'align'   => true,
 			'char'    => true,
 			'charoff' => true,
 			'span'    => true,
 			'dir'     => true,
 			'valign'  => true,
 			'width'   => true,
 		),
 		'colgroup'   => array(
 			'align'   => true,
 			'char'    => true,
 			'charoff' => true,
 			'span'    => true,
 			'valign'  => true,
 			'width'   => true,
 		),
 		'del'        => array(
 			'datetime' => true,
 		),
 		'dd'         => array(),
 		'dfn'        => array(),
 		'details'    => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'open'     => true,
 			'xml:lang' => true,
 		),
 		'div'        => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'dl'         => array(),
 		'dt'         => array(),
 		'em'         => array(),
 		'fieldset'   => array(),
 		'figure'     => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'figcaption' => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'font'       => array(
 			'color' => true,
 			'face'  => true,
 			'size'  => true,
 		),
 		'footer'     => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'h1'         => array(
 			'align' => true,
 		),
 		'h2'         => array(
 			'align' => true,
 		),
 		'h3'         => array(
 			'align' => true,
 		),
 		'h4'         => array(
 			'align' => true,
 		),
 		'h5'         => array(
 			'align' => true,
 		),
 		'h6'         => array(
 			'align' => true,
 		),
 		'header'     => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'hgroup'     => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'hr'         => array(
 			'align'   => true,
 			'noshade' => true,
 			'size'    => true,
 			'width'   => true,
 		),
 		'i'          => array(),
 		'img'        => array(
 			'alt'      => true,
 			'align'    => true,
 			'border'   => true,
 			'height'   => true,
 			'hspace'   => true,
 			'loading'  => true,
 			'longdesc' => true,
 			'vspace'   => true,
 			'src'      => true,
 			'usemap'   => true,
 			'width'    => true,
 		),
 		'ins'        => array(
 			'datetime' => true,
 			'cite'     => true,
 		),
 		'kbd'        => array(),
 		'label'      => array(
 			'for' => true,
 		),
 		'legend'     => array(
 			'align' => true,
 		),
 		'li'         => array(
 			'align' => true,
 			'value' => true,
 		),
 		'main'       => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'map'        => array(
 			'name' => true,
 		),
 		'mark'       => array(),
 		'menu'       => array(
 			'type' => true,
 		),
 		'nav'        => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'p'          => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'pre'        => array(
 			'width' => true,
 		),
 		'q'          => array(
 			'cite' => true,
 		),
 		's'          => array(),
 		'samp'       => array(),
 		'span'       => array(
 			'dir'      => true,
 			'align'    => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'section'    => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'small'      => array(),
 		'strike'     => array(),
 		'strong'     => array(),
 		'sub'        => array(),
 		'summary'    => array(
 			'align'    => true,
 			'dir'      => true,
 			'lang'     => true,
 			'xml:lang' => true,
 		),
 		'sup'        => array(),
 		'table'      => array(
 			'align'       => true,
 			'bgcolor'     => true,
 			'border'      => true,
 			'cellpadding' => true,
 			'cellspacing' => true,
 			'dir'         => true,
 			'rules'       => true,
 			'summary'     => true,
 			'width'       => true,
 		),
 		'tbody'      => array(
 			'align'   => true,
 			'char'    => true,
 			'charoff' => true,
 			'valign'  => true,
 		),
 		'td'         => array(
 			'abbr'    => true,
 			'align'   => true,
 			'axis'    => true,
 			'bgcolor' => true,
 			'char'    => true,
 			'charoff' => true,
 			'colspan' => true,
 			'dir'     => true,
 			'headers' => true,
 			'height'  => true,
 			'nowrap'  => true,
 			'rowspan' => true,
 			'scope'   => true,
 			'valign'  => true,
 			'width'   => true,
 		),
 		'textarea'   => array(
 			'cols'     => true,
 			'rows'     => true,
 			'disabled' => true,
 			'name'     => true,
 			'readonly' => true,
 		),
 		'tfoot'      => array(
 			'align'   => true,
 			'char'    => true,
 			'charoff' => true,
 			'valign'  => true,
 		),
 		'th'         => array(
 			'abbr'    => true,
 			'align'   => true,
 			'axis'    => true,
 			'bgcolor' => true,
 			'char'    => true,
 			'charoff' => true,
 			'colspan' => true,
 			'headers' => true,
 			'height'  => true,
 			'nowrap'  => true,
 			'rowspan' => true,
 			'scope'   => true,
 			'valign'  => true,
 			'width'   => true,
 		),
 		'thead'      => array(
 			'align'   => true,
 			'char'    => true,
 			'charoff' => true,
 			'valign'  => true,
 		),
 		'title'      => array(),
 		'tr'         => array(
 			'align'   => true,
 			'bgcolor' => true,
 			'char'    => true,
 			'charoff' => true,
 			'valign'  => true,
 		),
 		'track'      => array(
 			'default' => true,
 			'kind'    => true,
 			'label'   => true,
 			'src'     => true,
 			'srclang' => true,
 		),
 		'tt'         => array(),
 		'u'          => array(),
 		'ul'         => array(
 			'type' => true,
 		),
 		'ol'         => array(
 			'start'    => true,
 			'type'     => true,
 			'reversed' => true,
 		),
 		'var'        => array(),
 		'video'      => array(
 			'autoplay'    => true,
 			'controls'    => true,
 			'height'      => true,
 			'loop'        => true,
 			'muted'       => true,
 			'playsinline' => true,
 			'poster'      => true,
 			'preload'     => true,
 			'src'         => true,
 			'width'       => true,
 		),
 	);
 
 	/**
 	 * @var array[] $allowedtags Array of KSES allowed HTML elements.
 	 * @since 1.0.0
 	 */
 	$allowedtags = array(
 		'a'          => array(
 			'href'  => true,
 			'title' => true,
 		),
 		'abbr'       => array(
 			'title' => true,
 		),
 		'acronym'    => array(
 			'title' => true,
 		),
 		'b'          => array(),
 		'blockquote' => array(
 			'cite' => true,
 		),
 		'cite'       => array(),
 		'code'       => array(),
 		'del'        => array(
 			'datetime' => true,
 		),
 		'em'         => array(),
 		'i'          => array(),
 		'q'          => array(
 			'cite' => true,
 		),
 		's'          => array(),
 		'strike'     => array(),
 		'strong'     => array(),
 	);
 
 	/**
 	 * @var string[] $allowedentitynames Array of KSES allowed HTML entitity names.
 	 * @since 1.0.0
 	 */
 	$allowedentitynames = array(
 		'nbsp',
 		'iexcl',
 		'cent',
 		'pound',
 		'curren',
 		'yen',
 		'brvbar',
 		'sect',
 		'uml',
 		'copy',
 		'ordf',
 		'laquo',
 		'not',
 		'shy',
 		'reg',
 		'macr',
 		'deg',
 		'plusmn',
 		'acute',
 		'micro',
 		'para',
 		'middot',
 		'cedil',
 		'ordm',
 		'raquo',
 		'iquest',
 		'Agrave',
 		'Aacute',
 		'Acirc',
 		'Atilde',
 		'Auml',
 		'Aring',
 		'AElig',
 		'Ccedil',
 		'Egrave',
 		'Eacute',
 		'Ecirc',
 		'Euml',
 		'Igrave',
 		'Iacute',
 		'Icirc',
 		'Iuml',
 		'ETH',
 		'Ntilde',
 		'Ograve',
 		'Oacute',
 		'Ocirc',
 		'Otilde',
 		'Ouml',
 		'times',
 		'Oslash',
 		'Ugrave',
 		'Uacute',
 		'Ucirc',
 		'Uuml',
 		'Yacute',
 		'THORN',
 		'szlig',
 		'agrave',
 		'aacute',
 		'acirc',
 		'atilde',
 		'auml',
 		'aring',
 		'aelig',
 		'ccedil',
 		'egrave',
 		'eacute',
 		'ecirc',
 		'euml',
 		'igrave',
 		'iacute',
 		'icirc',
 		'iuml',
 		'eth',
 		'ntilde',
 		'ograve',
 		'oacute',
 		'ocirc',
 		'otilde',
 		'ouml',
 		'divide',
 		'oslash',
 		'ugrave',
 		'uacute',
 		'ucirc',
 		'uuml',
 		'yacute',
 		'thorn',
 		'yuml',
 		'quot',
 		'amp',
 		'lt',
 		'gt',
 		'apos',
 		'OElig',
 		'oelig',
 		'Scaron',
 		'scaron',
 		'Yuml',
 		'circ',
 		'tilde',
 		'ensp',
 		'emsp',
 		'thinsp',
 		'zwnj',
 		'zwj',
 		'lrm',
 		'rlm',
 		'ndash',
 		'mdash',
 		'lsquo',
 		'rsquo',
 		'sbquo',
 		'ldquo',
 		'rdquo',
 		'bdquo',
 		'dagger',
 		'Dagger',
 		'permil',
 		'lsaquo',
 		'rsaquo',
 		'euro',
 		'fnof',
 		'Alpha',
 		'Beta',
 		'Gamma',
 		'Delta',
 		'Epsilon',
 		'Zeta',
 		'Eta',
 		'Theta',
 		'Iota',
 		'Kappa',
 		'Lambda',
 		'Mu',
 		'Nu',
 		'Xi',
 		'Omicron',
 		'Pi',
 		'Rho',
 		'Sigma',
 		'Tau',
 		'Upsilon',
 		'Phi',
 		'Chi',
 		'Psi',
 		'Omega',
 		'alpha',
 		'beta',
 		'gamma',
 		'delta',
 		'epsilon',
 		'zeta',
 		'eta',
 		'theta',
 		'iota',
 		'kappa',
 		'lambda',
 		'mu',
 		'nu',
 		'xi',
 		'omicron',
 		'pi',
 		'rho',
 		'sigmaf',
 		'sigma',
 		'tau',
 		'upsilon',
 		'phi',
 		'chi',
 		'psi',
 		'omega',
 		'thetasym',
 		'upsih',
 		'piv',
 		'bull',
 		'hellip',
 		'prime',
 		'Prime',
 		'oline',
 		'frasl',
 		'weierp',
 		'image',
 		'real',
 		'trade',
 		'alefsym',
 		'larr',
 		'uarr',
 		'rarr',
 		'darr',
 		'harr',
 		'crarr',
 		'lArr',
 		'uArr',
 		'rArr',
 		'dArr',
 		'hArr',
 		'forall',
 		'part',
 		'exist',
 		'empty',
 		'nabla',
 		'isin',
 		'notin',
 		'ni',
 		'prod',
 		'sum',
 		'minus',
 		'lowast',
 		'radic',
 		'prop',
 		'infin',
 		'ang',
 		'and',
 		'or',
 		'cap',
 		'cup',
 		'int',
 		'sim',
 		'cong',
 		'asymp',
 		'ne',
 		'equiv',
 		'le',
 		'ge',
 		'sub',
 		'sup',
 		'nsub',
 		'sube',
 		'supe',
 		'oplus',
 		'otimes',
 		'perp',
 		'sdot',
 		'lceil',
 		'rceil',
 		'lfloor',
 		'rfloor',
 		'lang',
 		'rang',
 		'loz',
 		'spades',
 		'clubs',
 		'hearts',
 		'diams',
 		'sup1',
 		'sup2',
 		'sup3',
 		'frac14',
 		'frac12',
 		'frac34',
 		'there4',
 	);
 
 	/**
 	 * @var string[] $allowedxmlentitynames Array of KSES allowed XML entitity names.
 	 * @since 5.5.0
 	 */
 	$allowedxmlnamedentities = array(
 		'amp',
 		'lt',
 		'gt',
 		'apos',
 		'quot',
 	);
 
 	$allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags );
 } else {
 	$allowedtags     = wp_kses_array_lc( $allowedtags );
 	$allowedposttags = wp_kses_array_lc( $allowedposttags );
 }
 
 /**
  * Filters text content and strips out disallowed HTML.
  *
  * This function makes sure that only the allowed HTML element names, attribute
  * names, attribute values, and HTML entities will occur in the given text string.
  *
  * This function expects unslashed data.
  *
  * @see wp_kses_post() for specifically filtering post content and fields.
  * @see wp_allowed_protocols() for the default allowed protocols in link URLs.
  *
  * @since 1.0.0
  *
  * @param string         $string            Text content to filter.
  * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
  *                                          or a context name such as 'post'. See wp_kses_allowed_html()
  *                                          for the list of accepted context names.
  * @param string[]       $allowed_protocols Array of allowed URL protocols.
  * @return string Filtered content containing only the allowed HTML.
  */
 function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) {
 	if ( empty( $allowed_protocols ) ) {
 		$allowed_protocols = wp_allowed_protocols();
 	}
 
 	$string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );
 	$string = wp_kses_normalize_entities( $string );
 	$string = wp_kses_hook( $string, $allowed_html, $allowed_protocols );
 
 	return wp_kses_split( $string, $allowed_html, $allowed_protocols );
 }
 
 /**
  * Filters one HTML attribute and ensures its value is allowed.
  *
  * This function can escape data in some situations where `wp_kses()` must strip the whole attribute.
  *
  * @since 4.2.3
  *
  * @param string $string  The 'whole' attribute, including name and value.
  * @param string $element The HTML element name to which the attribute belongs.
  * @return string Filtered attribute.
  */
 function wp_kses_one_attr( $string, $element ) {
 	$uris              = wp_kses_uri_attributes();
 	$allowed_html      = wp_kses_allowed_html( 'post' );
 	$allowed_protocols = wp_allowed_protocols();
 	$string            = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );
 
 	// Preserve leading and trailing whitespace.
 	$matches = array();
 	preg_match( '/^\s*/', $string, $matches );
 	$lead = $matches[0];
 	preg_match( '/\s*$/', $string, $matches );
 	$trail = $matches[0];
 	if ( empty( $trail ) ) {
 		$string = substr( $string, strlen( $lead ) );
 	} else {
 		$string = substr( $string, strlen( $lead ), -strlen( $trail ) );
 	}
 
 	// Parse attribute name and value from input.
 	$split = preg_split( '/\s*=\s*/', $string, 2 );
 	$name  = $split[0];
 	if ( count( $split ) == 2 ) {
 		$value = $split[1];
 
 		// Remove quotes surrounding $value.
 		// Also guarantee correct quoting in $string for this one attribute.
 		if ( '' === $value ) {
 			$quote = '';
 		} else {
 			$quote = $value[0];
 		}
 		if ( '"' === $quote || "'" === $quote ) {
 			if ( substr( $value, -1 ) != $quote ) {
 				return '';
 			}
 			$value = substr( $value, 1, -1 );
 		} else {
 			$quote = '"';
 		}
 
 		// Sanitize quotes, angle braces, and entities.
 		$value = esc_attr( $value );
 
 		// Sanitize URI values.
 		if ( in_array( strtolower( $name ), $uris, true ) ) {
 			$value = wp_kses_bad_protocol( $value, $allowed_protocols );
 		}
 
 		$string = "$name=$quote$value$quote";
 		$vless  = 'n';
 	} else {
 		$value = '';
 		$vless = 'y';
 	}
 
 	// Sanitize attribute by name.
 	wp_kses_attr_check( $name, $value, $string, $vless, $element, $allowed_html );
 
 	// Restore whitespace.
 	return $lead . $string . $trail;
 }
 
 /**
  * Returns an array of allowed HTML tags and attributes for a given context.
  *
  * @since 3.5.0
  * @since 5.0.1 `form` removed as allowable HTML tag.
  *
  * @global array $allowedposttags
  * @global array $allowedtags
  * @global array $allowedentitynames
  *
  * @param string|array $context The context for which to retrieve tags. Allowed values are 'post',
  *                              'strip', 'data', 'entities', or the name of a field filter such as
  *                              'pre_user_description'.
  * @return array Array of allowed HTML tags and their allowed attributes.
  */
 function wp_kses_allowed_html( $context = '' ) {
 	global $allowedposttags, $allowedtags, $allowedentitynames;
 
 	if ( is_array( $context ) ) {
 		/**
 		 * Filters the HTML that is allowed for a given context.
 		 *
 		 * @since 3.5.0
 		 *
 		 * @param array[]|string $context      Context to judge allowed tags by.
 		 * @param string         $context_type Context name.
 		 */
 		return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' );
 	}
 
 	switch ( $context ) {
 		case 'post':
 			/** This filter is documented in wp-includes/kses.php */
 			$tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );
 
 			// 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`.
 			if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) {
 				$tags = $allowedposttags;
 
 				$tags['form'] = array(
 					'action'         => true,
 					'accept'         => true,
 					'accept-charset' => true,
 					'enctype'        => true,
 					'method'         => true,
 					'name'           => true,
 					'target'         => true,
 				);
 
 				/** This filter is documented in wp-includes/kses.php */
 				$tags = apply_filters( 'wp_kses_allowed_html', $tags, $context );
 			}
 
 			return $tags;
 
 		case 'user_description':
 		case 'pre_user_description':
 			$tags             = $allowedtags;
 			$tags['a']['rel'] = true;
 			/** This filter is documented in wp-includes/kses.php */
 			return apply_filters( 'wp_kses_allowed_html', $tags, $context );
 
 		case 'strip':
 			/** This filter is documented in wp-includes/kses.php */
 			return apply_filters( 'wp_kses_allowed_html', array(), $context );
 
 		case 'entities':
 			/** This filter is documented in wp-includes/kses.php */
 			return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context );
 
 		case 'data':
 		default:
 			/** This filter is documented in wp-includes/kses.php */
 			return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context );
 	}
 }
 
 /**
  * You add any KSES hooks here.
  *
  * There is currently only one KSES WordPress hook, {@see 'pre_kses'}, and it is called here.
  * All parameters are passed to the hooks and expected to receive a string.
  *
  * @since 1.0.0
  *
  * @param string         $string            Content to filter through KSES.
  * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
  *                                          or a context name such as 'post'. See wp_kses_allowed_html()
  *                                          for the list of accepted context names.
  * @param string[]       $allowed_protocols Array of allowed URL protocols.
  * @return string Filtered content through {@see 'pre_kses'} hook.
  */
 function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) {
 	/**
 	 * Filters content to be run through KSES.
 	 *
 	 * @since 2.3.0
 	 *
 	 * @param string         $string            Content to filter through KSES.
 	 * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
 	 *                                          or a context name such as 'post'. See wp_kses_allowed_html()
 	 *                                          for the list of accepted context names.
 	 * @param string[]       $allowed_protocols Array of allowed URL protocols.
 	 */
 	return apply_filters( 'pre_kses', $string, $allowed_html, $allowed_protocols );
 }
 
 /**
  * Returns the version number of KSES.
  *
  * @since 1.0.0
  *
  * @return string KSES version number.
  */
 function wp_kses_version() {
 	return '0.2.2';
 }
 
 /**
  * Searches for HTML tags, no matter how malformed.
  *
  * It also matches stray `>` characters.
  *
  * @since 1.0.0
  *
  * @global array[]|string $pass_allowed_html      An array of allowed HTML elements and attributes,
  *                                                or a context name such as 'post'.
  * @global string[]       $pass_allowed_protocols Array of allowed URL protocols.
  *
  * @param string         $string            Content to filter.
  * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
  *                                          or a context name such as 'post'. See wp_kses_allowed_html()
  *                                          for the list of accepted context names.
  * @param string[]       $allowed_protocols Array of allowed URL protocols.
  * @return string Content with fixed HTML tags
  */
 function wp_kses_split( $string, $allowed_html, $allowed_protocols ) {
 	global $pass_allowed_html, $pass_allowed_protocols;
 
 	$pass_allowed_html      = $allowed_html;
 	$pass_allowed_protocols = $allowed_protocols;
 
 	return preg_replace_callback( '%(<!--.*?(-->|$))|(<[^>]*(>|$)|>)%', '_wp_kses_split_callback', $string );
 }
 
 /**
  * Returns an array of HTML attribute names whose value contains a URL.
  *
  * This function returns a list of all HTML attributes that must contain
  * a URL according to the HTML specification.
  *
  * This list includes URI attributes both allowed and disallowed by KSES.
  *
  * @link https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes
  *
  * @since 5.0.1
  *
  * @return string[] HTML attribute names whose value contains a URL.
  */
 function wp_kses_uri_attributes() {
 	$uri_attributes = array(
 		'action',
 		'archive',
 		'background',
 		'cite',
 		'classid',
 		'codebase',
 		'data',
 		'formaction',
 		'href',
 		'icon',
 		'longdesc',
 		'manifest',
 		'poster',
 		'profile',
 		'src',
 		'usemap',
 		'xmlns',
 	);
 
 	/**
 	 * Filters the list of attributes that are required to contain a URL.
 	 *
 	 * Use this filter to add any `data-` attributes that are required to be
 	 * validated as a URL.
 	 *
 	 * @since 5.0.1
 	 *
 	 * @param string[] $uri_attributes HTML attribute names whose value contains a URL.
 	 */
 	$uri_attributes = apply_filters( 'wp_kses_uri_attributes', $uri_attributes );
 
 	return $uri_attributes;
 }
 
 /**
  * Callback for `wp_kses_split()`.
  *
  * @since 3.1.0
  * @access private
  * @ignore
  *
  * @global array[]|string $pass_allowed_html      An array of allowed HTML elements and attributes,
  *                                                or a context name such as 'post'.
  * @global string[]       $pass_allowed_protocols Array of allowed URL protocols.
  *
  * @param array $matches preg_replace regexp matches
  * @return string
  */
 function _wp_kses_split_callback( $match ) {
 	global $pass_allowed_html, $pass_allowed_protocols;
 
 	return wp_kses_split2( $match[0], $pass_allowed_html, $pass_allowed_protocols );
 }
 
 /**
  * Callback for `wp_kses_split()` for fixing malformed HTML tags.
  *
  * This function does a lot of work. It rejects some very malformed things like
  * `<:::>`. It returns an empty string, if the element isn't allowed (look ma, no
  * `strip_tags()`!). Otherwise it splits the tag into an element and an attribute
  * list.
  *
  * After the tag is split into an element and an attribute list, it is run
  * through another filter which will remove illegal attributes and once that is
  * completed, will be returned.
  *
  * @access private
  * @ignore
  * @since 1.0.0
  *
  * @param string         $string            Content to filter.
  * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
  *                                          or a context name such as 'post'. See wp_kses_allowed_html()
  *                                          for the list of accepted context names.
  * @param string[]       $allowed_protocols Array of allowed URL protocols.
  * @return string Fixed HTML element
  */
 function wp_kses_split2( $string, $allowed_html, $allowed_protocols ) {
 	$string = wp_kses_stripslashes( $string );
 
 	// It matched a ">" character.
 	if ( '<' !== substr( $string, 0, 1 ) ) {
 		return '&gt;';
 	}
 
 	// Allow HTML comments.
 	if ( '<!--' === substr( $string, 0, 4 ) ) {
 		$string = str_replace( array( '<!--', '-->' ), '', $string );
 		while ( ( $newstring = wp_kses( $string, $allowed_html, $allowed_protocols ) ) != $string ) {
 			$string = $newstring;
 		}
 		if ( '' === $string ) {
 			return '';
 		}
 		// Prevent multiple dashes in comments.
 		$string = preg_replace( '/--+/', '-', $string );
 		// Prevent three dashes closing a comment.
 		$string = preg_replace( '/-$/', '', $string );
 		return "<!--{$string}-->";
 	}
 
 	// It's seriously malformed.
 	if ( ! preg_match( '%^<\s*(/\s*)?([a-zA-Z0-9-]+)([^>]*)>?$%', $string, $matches ) ) {
 		return '';
 	}
 
 	$slash    = trim( $matches[1] );
 	$elem     = $matches[2];
 	$attrlist = $matches[3];
 
 	if ( ! is_array( $allowed_html ) ) {
 		$allowed_html = wp_kses_allowed_html( $allowed_html );
 	}
 
 	// They are using a not allowed HTML element.
 	if ( ! isset( $allowed_html[ strtolower( $elem ) ] ) ) {
 		return '';
 	}
 
 	// No attributes are allowed for closing elements.
 	if ( '' !== $slash ) {
 		return "</$elem>";
 	}
 
 	return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols );
 }
 
 /**
  * Removes all attributes, if none are allowed for this element.
  *
  * If some are allowed it calls `wp_kses_hair()` to split them further, and then
  * it builds up new HTML code from the data that `kses_hair()` returns. It also
  * removes `<` and `>` characters, if there are any left. One more thing it does
  * is to check if the tag has a closing XHTML slash, and if it does, it puts one
  * in the returned code as well.
  *
  * @since 1.0.0
  *
  * @param string         $element           HTML element/tag.
  * @param string         $attr              HTML attributes from HTML element to closing HTML element tag.
  * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
  *                                          or a context name such as 'post'. See wp_kses_allowed_html()
  *                                          for the list of accepted context names.
  * @param string[]       $allowed_protocols Array of allowed URL protocols.
  * @return string Sanitized HTML element.
  */
 function wp_kses_attr( $element, $attr, $allowed_html, $allowed_protocols ) {
 	if ( ! is_array( $allowed_html ) ) {
 		$allowed_html = wp_kses_allowed_html( $allowed_html );
 	}
 
 	// Is there a closing XHTML slash at the end of the attributes?
 	$xhtml_slash = '';
 	if ( preg_match( '%\s*/\s*$%', $attr ) ) {
 		$xhtml_slash = ' /';
 	}
 
 	// Are any attributes allowed at all for this element?
 	$element_low = strtolower( $element );
 	if ( empty( $allowed_html[ $element_low ] ) || true === $allowed_html[ $element_low ] ) {
 		return "<$element$xhtml_slash>";
 	}
 
 	// Split it.
 	$attrarr = wp_kses_hair( $attr, $allowed_protocols );
 
 	// Go through $attrarr, and save the allowed attributes for this element
 	// in $attr2.
 	$attr2 = '';
 	foreach ( $attrarr as $arreach ) {
 		if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) {
 			$attr2 .= ' ' . $arreach['whole'];
 		}
 	}
 
 	// Remove any "<" or ">" characters.
 	$attr2 = preg_replace( '/[<>]/', '', $attr2 );
 
 	return "<$element$attr2$xhtml_slash>";
 }
 
 /**
  * Determines whether an attribute is allowed.
  *
  * @since 4.2.3
  * @since 5.0.0 Add support for `data-*` wildcard attributes.
  *
  * @param string $name         The attribute name. Passed by reference. Returns empty string when not allowed.
  * @param string $value        The attribute value. Passed by reference. Returns a filtered value.
  * @param string $whole        The `name=value` input. Passed by reference. Returns filtered input.
  * @param string $vless        Whether the attribute is valueless. Use 'y' or 'n'.
  * @param string $element      The name of the element to which this attribute belongs.
  * @param array  $allowed_html The full list of allowed elements and attributes.
  * @return bool Whether or not the attribute is allowed.
  */
 function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) {
 	$name_low    = strtolower( $name );
 	$element_low = strtolower( $element );
 
 	if ( ! isset( $allowed_html[ $element_low ] ) ) {
 		$name  = '';
 		$value = '';
 		$whole = '';
 		return false;
 	}
 
 	$allowed_attr = $allowed_html[ $element_low ];
 
 	if ( ! isset( $allowed_attr[ $name_low ] ) || '' === $allowed_attr[ $name_low ] ) {
 		/*
 		 * Allow `data-*` attributes.
 		 *
 		 * When specifying `$allowed_html`, the attribute name should be set as
 		 * `data-*` (not to be mixed with the HTML 4.0 `data` attribute, see
 		 * https://www.w3.org/TR/html40/struct/objects.html#adef-data).
 		 *
 		 * Note: the attribute name should only contain `A-Za-z0-9_-` chars,
 		 * double hyphens `--` are not accepted by WordPress.
 		 */
 		if ( strpos( $name_low, 'data-' ) === 0 && ! empty( $allowed_attr['data-*'] ) && preg_match( '/^data(?:-[a-z0-9_]+)+$/', $name_low, $match ) ) {
 			/*
 			 * Add the whole attribute name to the allowed attributes and set any restrictions
 			 * for the `data-*` attribute values for the current element.
 			 */
 			$allowed_attr[ $match[0] ] = $allowed_attr['data-*'];
 		} else {
 			$name  = '';
 			$value = '';
 			$whole = '';
 			return false;
 		}
 	}
 
 	if ( 'style' === $name_low ) {
 		$new_value = safecss_filter_attr( $value );
 
 		if ( empty( $new_value ) ) {
 			$name  = '';
 			$value = '';
 			$whole = '';
 			return false;
 		}
 
 		$whole = str_replace( $value, $new_value, $whole );
 		$value = $new_value;
 	}
 
 	if ( is_array( $allowed_attr[ $name_low ] ) ) {
 		// There are some checks.
 		foreach ( $allowed_attr[ $name_low ] as $currkey => $currval ) {
 			if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) {
 				$name  = '';
 				$value = '';
 				$whole = '';
 				return false;
 			}
 		}
 	}
 
 	return true;
 }
 
 /**
  * Builds an attribute list from string containing attributes.
  *
  * This function does a lot of work. It parses an attribute list into an array
  * with attribute data, and tries to do the right thing even if it gets weird
  * input. It will add quotes around attribute values that don't have any quotes
  * or apostrophes around them, to make it easier to produce HTML code that will
  * conform to W3C's HTML specification. It will also remove bad URL protocols
  * from attribute values. It also reduces duplicate attributes by using the
  * attribute defined first (`foo='bar' foo='baz'` will result in `foo='bar'`).
  *
  * @since 1.0.0
  *
  * @param string   $attr              Attribute list from HTML element to closing HTML element tag.
  * @param string[] $allowed_protocols Array of allowed URL protocols.
  * @return array[] Array of attribute information after parsing.
  */
 function wp_kses_hair( $attr, $allowed_protocols ) {
 	$attrarr  = array();
 	$mode     = 0;
 	$attrname = '';
 	$uris     = wp_kses_uri_attributes();
 
 	// Loop through the whole attribute list.
 
 	while ( strlen( $attr ) != 0 ) {
 		$working = 0; // Was the last operation successful?
 
 		switch ( $mode ) {
 			case 0:
 				if ( preg_match( '/^([_a-zA-Z][-_a-zA-Z0-9:.]*)/', $attr, $match ) ) {
 					$attrname = $match[1];
 					$working  = 1;
 					$mode     = 1;
 					$attr     = preg_replace( '/^[_a-zA-Z][-_a-zA-Z0-9:.]*/', '', $attr );
 				}
 
 				break;
 
 			case 1:
 				if ( preg_match( '/^\s*=\s*/', $attr ) ) { // Equals sign.
 					$working = 1;
 					$mode    = 2;
 					$attr    = preg_replace( '/^\s*=\s*/', '', $attr );
 					break;
 				}
 
 				if ( preg_match( '/^\s+/', $attr ) ) { // Valueless.
 					$working = 1;
 					$mode    = 0;
 					if ( false === array_key_exists( $attrname, $attrarr ) ) {
 						$attrarr[ $attrname ] = array(
 							'name'  => $attrname,
 							'value' => '',
 							'whole' => $attrname,
 							'vless' => 'y',
 						);
 					}
 					$attr = preg_replace( '/^\s+/', '', $attr );
 				}
 
 				break;
 
 			case 2:
 				if ( preg_match( '%^"([^"]*)"(\s+|/?$)%', $attr, $match ) ) {
 					// "value"
 					$thisval = $match[1];
 					if ( in_array( strtolower( $attrname ), $uris, true ) ) {
 						$thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols );
 					}
 
 					if ( false === array_key_exists( $attrname, $attrarr ) ) {
 						$attrarr[ $attrname ] = array(
 							'name'  => $attrname,
 							'value' => $thisval,
 							'whole' => "$attrname=\"$thisval\"",
 							'vless' => 'n',
 						);
 					}
 					$working = 1;
 					$mode    = 0;
 					$attr    = preg_replace( '/^"[^"]*"(\s+|$)/', '', $attr );
 					break;
 				}
 
 				if ( preg_match( "%^'([^']*)'(\s+|/?$)%", $attr, $match ) ) {
 					// 'value'
 					$thisval = $match[1];
 					if ( in_array( strtolower( $attrname ), $uris, true ) ) {
 						$thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols );
 					}
 
 					if ( false === array_key_exists( $attrname, $attrarr ) ) {
 						$attrarr[ $attrname ] = array(
 							'name'  => $attrname,
 							'value' => $thisval,
 							'whole' => "$attrname='$thisval'",
 							'vless' => 'n',
 						);
 					}
 					$working = 1;
 					$mode    = 0;
 					$attr    = preg_replace( "/^'[^']*'(\s+|$)/", '', $attr );
 					break;
 				}
 
 				if ( preg_match( "%^([^\s\"']+)(\s+|/?$)%", $attr, $match ) ) {
 					// value
 					$thisval = $match[1];
 					if ( in_array( strtolower( $attrname ), $uris, true ) ) {
 						$thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols );
 					}
 
 					if ( false === array_key_exists( $attrname, $attrarr ) ) {
 						$attrarr[ $attrname ] = array(
 							'name'  => $attrname,
 							'value' => $thisval,
 							'whole' => "$attrname=\"$thisval\"",
 							'vless' => 'n',
 						);
 					}
 					// We add quotes to conform to W3C's HTML spec.
 					$working = 1;
 					$mode    = 0;
 					$attr    = preg_replace( "%^[^\s\"']+(\s+|$)%", '', $attr );
 				}
 
 				break;
 		} // End switch.
 
 		if ( 0 == $working ) { // Not well-formed, remove and try again.
 			$attr = wp_kses_html_error( $attr );
 			$mode = 0;
 		}
 	} // End while.
 
 	if ( 1 == $mode && false === array_key_exists( $attrname, $attrarr ) ) {
 		// Special case, for when the attribute list ends with a valueless
 		// attribute like "selected".
 		$attrarr[ $attrname ] = array(
 			'name'  => $attrname,
 			'value' => '',
 			'whole' => $attrname,
 			'vless' => 'y',
 		);
 	}
 
 	return $attrarr;
 }
 
 /**
  * Finds all attributes of an HTML element.
  *
  * Does not modify input.  May return "evil" output.
  *
  * Based on `wp_kses_split2()` and `wp_kses_attr()`.
  *
  * @since 4.2.3
  *
  * @param string $element HTML element.
  * @return array|false List of attributes found in the element. Returns false on failure.
  */
 function wp_kses_attr_parse( $element ) {
 	$valid = preg_match( '%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches );
 	if ( 1 !== $valid ) {
 		return false;
 	}
 
 	$begin  = $matches[1];
 	$slash  = $matches[2];
 	$elname = $matches[3];
 	$attr   = $matches[4];
 	$end    = $matches[5];
 
 	if ( '' !== $slash ) {
 		// Closing elements do not get parsed.
 		return false;
 	}
 
 	// Is there a closing XHTML slash at the end of the attributes?
 	if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) {
 		$xhtml_slash = $matches[0];
 		$attr        = substr( $attr, 0, -strlen( $xhtml_slash ) );
 	} else {
 		$xhtml_slash = '';
 	}
 
 	// Split it.
 	$attrarr = wp_kses_hair_parse( $attr );
 	if ( false === $attrarr ) {
 		return false;
 	}
 
 	// Make sure all input is returned by adding front and back matter.
 	array_unshift( $attrarr, $begin . $slash . $elname );
 	array_push( $attrarr, $xhtml_slash . $end );
 
 	return $attrarr;
 }
 
 /**
  * Builds an attribute list from string containing attributes.
  *
  * Does not modify input.  May return "evil" output.
  * In case of unexpected input, returns false instead of stripping things.
  *
  * Based on `wp_kses_hair()` but does not return a multi-dimensional array.
  *
  * @since 4.2.3
  *
  * @param string $attr Attribute list from HTML element to closing HTML element tag.
  * @return array|false List of attributes found in $attr. Returns false on failure.
  */
 function wp_kses_hair_parse( $attr ) {
 	if ( '' === $attr ) {
 		return array();
 	}
 
 	// phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 	$regex =
 		'(?:'
 		.     '[_a-zA-Z][-_a-zA-Z0-9:.]*' // Attribute name.
 		. '|'
 		.     '\[\[?[^\[\]]+\]\]?'        // Shortcode in the name position implies unfiltered_html.
 		. ')'
 		. '(?:'               // Attribute value.
 		.     '\s*=\s*'       // All values begin with '='.
 		.     '(?:'
 		.         '"[^"]*"'   // Double-quoted.
 		.     '|'
 		.         "'[^']*'"   // Single-quoted.
 		.     '|'
 		.         '[^\s"\']+' // Non-quoted.
 		.         '(?:\s|$)'  // Must have a space.
 		.     ')'
 		. '|'
 		.     '(?:\s|$)'      // If attribute has no value, space is required.
 		. ')'
 		. '\s*';              // Trailing space is optional except as mentioned above.
 	// phpcs:enable
 
 	// Although it is possible to reduce this procedure to a single regexp,
 	// we must run that regexp twice to get exactly the expected result.
 
 	$validation = "%^($regex)+$%";
 	$extraction = "%$regex%";
 
 	if ( 1 === preg_match( $validation, $attr ) ) {
 		preg_match_all( $extraction, $attr, $attrarr );
 		return $attrarr[0];
 	} else {
 		return false;
 	}
 }
 
 /**
  * Performs different checks for attribute values.
  *
  * The currently implemented checks are "maxlen", "minlen", "maxval", "minval",
  * and "valueless".
  *
  * @since 1.0.0
  *
  * @param string $value      Attribute value.
  * @param string $vless      Whether the attribute is valueless. Use 'y' or 'n'.
  * @param string $checkname  What $checkvalue is checking for.
  * @param mixed  $checkvalue What constraint the value should pass.
  * @return bool Whether check passes.
  */
 function wp_kses_check_attr_val( $value, $vless, $checkname, $checkvalue ) {
 	$ok = true;
 
 	switch ( strtolower( $checkname ) ) {
 		case 'maxlen':
 			/*
 			 * The maxlen check makes sure that the attribute value has a length not
 			 * greater than the given value. This can be used to avoid Buffer Overflows
 			 * in WWW clients and various Internet servers.
 			 */
 
 			if ( strlen( $value ) > $checkvalue ) {
 				$ok = false;
 			}
 			break;
 
 		case 'minlen':
 			/*
 			 * The minlen check makes sure that the attribute value has a length not
 			 * smaller than the given value.
 			 */
 
 			if ( strlen( $value ) < $checkvalue ) {
 				$ok = false;
 			}
 			break;
 
 		case 'maxval':
 			/*
 			 * The maxval check does two things: it checks that the attribute value is
 			 * an integer from 0 and up, without an excessive amount of zeroes or
 			 * whitespace (to avoid Buffer Overflows). It also checks that the attribute
 			 * value is not greater than the given value.
 			 * This check can be used to avoid Denial of Service attacks.
 			 */
 
 			if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) {
 				$ok = false;
 			}
 			if ( $value > $checkvalue ) {
 				$ok = false;
 			}
 			break;
 
 		case 'minval':
 			/*
 			 * The minval check makes sure that the attribute value is a positive integer,
 			 * and that it is not smaller than the given value.
 			 */
 
 			if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) {
 				$ok = false;
 			}
 			if ( $value < $checkvalue ) {
 				$ok = false;
 			}
 			break;
 
 		case 'valueless':
 			/*
 			 * The valueless check makes sure if the attribute has a value
 			 * (like `<a href="blah">`) or not (`<option selected>`). If the given value
 			 * is a "y" or a "Y", the attribute must not have a value.
 			 * If the given value is an "n" or an "N", the attribute must have a value.
 			 */
 
 			if ( strtolower( $checkvalue ) != $vless ) {
 				$ok = false;
 			}
 			break;
 	} // End switch.
 
 	return $ok;
 }
 
 /**
  * Sanitizes a string and removed disallowed URL protocols.
  *
  * This function removes all non-allowed protocols from the beginning of the
  * string. It ignores whitespace and the case of the letters, and it does
  * understand HTML entities. It does its work recursively, so it won't be
  * fooled by a string like `javascript:javascript:alert(57)`.
  *
  * @since 1.0.0
  *
  * @param string   $string            Content to filter bad protocols from.
  * @param string[] $allowed_protocols Array of allowed URL protocols.
  * @return string Filtered content.
  */
 function wp_kses_bad_protocol( $string, $allowed_protocols ) {
 	$string     = wp_kses_no_null( $string );
 	$iterations = 0;
 
 	do {
 		$original_string = $string;
 		$string          = wp_kses_bad_protocol_once( $string, $allowed_protocols );
 	} while ( $original_string != $string && ++$iterations < 6 );
 
 	if ( $original_string != $string ) {
 		return '';
 	}
 
 	return $string;
 }
 
 /**
  * Removes any invalid control characters in a text string.
  *
  * Also removes any instance of the `\0` string.
  *
  * @since 1.0.0
  *
  * @param string $string  Content to filter null characters from.
  * @param array  $options Set 'slash_zero' => 'keep' when '\0' is allowed. Default is 'remove'.
  * @return string Filtered content.
  */
 function wp_kses_no_null( $string, $options = null ) {
 	if ( ! isset( $options['slash_zero'] ) ) {
 		$options = array( 'slash_zero' => 'remove' );
 	}
 
 	$string = preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string );
 	if ( 'remove' === $options['slash_zero'] ) {
 		$string = preg_replace( '/\\\\+0+/', '', $string );
 	}
 
 	return $string;
 }
 
 /**
  * Strips slashes from in front of quotes.
  *
  * This function changes the character sequence `\"` to just `"`. It leaves all other
  * slashes alone. The quoting from `preg_replace(//e)` requires this.
  *
  * @since 1.0.0
  *
  * @param string $string String to strip slashes from.
  * @return string Fixed string with quoted slashes.
  */
 function wp_kses_stripslashes( $string ) {
 	return preg_replace( '%\\\\"%', '"', $string );
 }
 
 /**
  * Converts the keys of an array to lowercase.
  *
  * @since 1.0.0
  *
  * @param array $inarray Unfiltered array.
  * @return array Fixed array with all lowercase keys.
  */
 function wp_kses_array_lc( $inarray ) {
 	$outarray = array();
 
 	foreach ( (array) $inarray as $inkey => $inval ) {
 		$outkey              = strtolower( $inkey );
 		$outarray[ $outkey ] = array();
 
 		foreach ( (array) $inval as $inkey2 => $inval2 ) {
 			$outkey2                         = strtolower( $inkey2 );
 			$outarray[ $outkey ][ $outkey2 ] = $inval2;
 		}
 	}
 
 	return $outarray;
 }
 
 /**
  * Handles parsing errors in `wp_kses_hair()`.
  *
  * The general plan is to remove everything to and including some whitespace,
  * but it deals with quotes and apostrophes as well.
  *
  * @since 1.0.0
  *
  * @param string $string
  * @return string
  */
 function wp_kses_html_error( $string ) {
 	return preg_replace( '/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string );
 }
 
 /**
  * Sanitizes content from bad protocols and other characters.
  *
  * This function searches for URL protocols at the beginning of the string, while
  * handling whitespace and HTML entities.
  *
  * @since 1.0.0
  *
  * @param string   $string            Content to check for bad protocols.
  * @param string[] $allowed_protocols Array of allowed URL protocols.
  * @param int      $count             Depth of call recursion to this function.
  * @return string Sanitized content.
  */
 function wp_kses_bad_protocol_once( $string, $allowed_protocols, $count = 1 ) {
 	$string  = preg_replace( '/(&#0*58(?![;0-9])|&#x0*3a(?![;a-f0-9]))/i', '$1;', $string );
 	$string2 = preg_split( '/:|&#0*58;|&#x0*3a;|&colon;/i', $string, 2 );
 	if ( isset( $string2[1] ) && ! preg_match( '%/\?%', $string2[0] ) ) {
 		$string   = trim( $string2[1] );
 		$protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols );
 		if ( 'feed:' === $protocol ) {
 			if ( $count > 2 ) {
 				return '';
 			}
 			$string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count );
 			if ( empty( $string ) ) {
 				return $string;
 			}
 		}
 		$string = $protocol . $string;
 	}
 
 	return $string;
 }
 
 /**
  * Callback for `wp_kses_bad_protocol_once()` regular expression.
  *
  * This function processes URL protocols, checks to see if they're in the
  * list of allowed protocols or not, and returns different data depending
  * on the answer.
  *
  * @access private
  * @ignore
  * @since 1.0.0
  *
  * @param string   $string            URI scheme to check against the list of allowed protocols.
  * @param string[] $allowed_protocols Array of allowed URL protocols.
  * @return string Sanitized content.
  */
 function wp_kses_bad_protocol_once2( $string, $allowed_protocols ) {
 	$string2 = wp_kses_decode_entities( $string );
 	$string2 = preg_replace( '/\s/', '', $string2 );
 	$string2 = wp_kses_no_null( $string2 );
 	$string2 = strtolower( $string2 );
 
 	$allowed = false;
 	foreach ( (array) $allowed_protocols as $one_protocol ) {
 		if ( strtolower( $one_protocol ) == $string2 ) {
 			$allowed = true;
 			break;
 		}
 	}
 
 	if ( $allowed ) {
 		return "$string2:";
 	} else {
 		return '';
 	}
 }
 
 /**
  * Converts and fixes HTML entities.
  *
  * This function normalizes HTML entities. It will convert `AT&T` to the correct
  * `AT&amp;T`, `&#00058;` to `&#058;`, `&#XYZZY;` to `&amp;#XYZZY;` and so on.
  *
  * When `$context` is set to 'xml', HTML entities are converted to their code points.  For
  * example, `AT&T&hellip;&#XYZZY;` is converted to `AT&amp;T…&amp;#XYZZY;`.
  *
  * @since 1.0.0
  * @since 5.5.0 Added `$context` parameter.
  *
  * @param string $string  Content to normalize entities.
  * @param string $context Context for normalization. Can be either 'html' or 'xml'.
  *                        Default 'html'.
  * @return string Content with normalized entities.
  */
 function wp_kses_normalize_entities( $string, $context = 'html' ) {
 	// Disarm all entities by converting & to &amp;
 	$string = str_replace( '&', '&amp;', $string );
 
 	// Change back the allowed entities in our list of allowed entities.
 	if ( 'xml' === $context ) {
 		$string = preg_replace_callback( '/&amp;([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_xml_named_entities', $string );
 	} else {
 		$string = preg_replace_callback( '/&amp;([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $string );
 	}
 	$string = preg_replace_callback( '/&amp;#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string );
 	$string = preg_replace_callback( '/&amp;#[Xx](0*[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $string );
 
 	return $string;
 }
 
 /**
  * Callback for `wp_kses_normalize_entities()` regular expression.
  *
  * This function only accepts valid named entity references, which are finite,
  * case-sensitive, and highly scrutinized by HTML and XML validators.
  *
  * @since 3.0.0
  *
  * @global array $allowedentitynames
  *
  * @param array $matches preg_replace_callback() matches array.
  * @return string Correctly encoded entity.
  */
 function wp_kses_named_entities( $matches ) {
 	global $allowedentitynames;
 
 	if ( empty( $matches[1] ) ) {
 		return '';
 	}
 
 	$i = $matches[1];
 	return ( ! in_array( $i, $allowedentitynames, true ) ) ? "&amp;$i;" : "&$i;";
 }
 
 /**
  * Callback for `wp_kses_normalize_entities()` regular expression.
  *
  * This function only accepts valid named entity references, which are finite,
  * case-sensitive, and highly scrutinized by XML validators.  HTML named entity
  * references are converted to their code points.
  *
  * @since 5.5.0
  *
  * @global array $allowedentitynames
  * @global array $allowedxmlnamedentities
  *
  * @param array $matches preg_replace_callback() matches array.
  * @return string Correctly encoded entity.
  */
 function wp_kses_xml_named_entities( $matches ) {
 	global $allowedentitynames, $allowedxmlnamedentities;
 
 	if ( empty( $matches[1] ) ) {
 		return '';
 	}
 
 	$i = $matches[1];
 
 	if ( in_array( $i, $allowedxmlnamedentities, true ) ) {
 		return "&$i;";
 	} elseif ( in_array( $i, $allowedentitynames, true ) ) {
 		return html_entity_decode( "&$i;", ENT_HTML5 );
 	}
 
 	return "&amp;$i;";
 }
 
 /**
  * Callback for `wp_kses_normalize_entities()` regular expression.
  *
  * This function helps `wp_kses_normalize_entities()` to only accept 16-bit
  * values and nothing more for `&#number;` entities.
  *
  * @access private
  * @ignore
  * @since 1.0.0
  *
  * @param array $matches `preg_replace_callback()` matches array.
  * @return string Correctly encoded entity.
  */
 function wp_kses_normalize_entities2( $matches ) {
 	if ( empty( $matches[1] ) ) {
 		return '';
 	}
 
 	$i = $matches[1];
 	if ( valid_unicode( $i ) ) {
 		$i = str_pad( ltrim( $i, '0' ), 3, '0', STR_PAD_LEFT );
 		$i = "&#$i;";
 	} else {
 		$i = "&amp;#$i;";
 	}
 
 	return $i;
 }
 
 /**
  * Callback for `wp_kses_normalize_entities()` for regular expression.
  *
  * This function helps `wp_kses_normalize_entities()` to only accept valid Unicode
  * numeric entities in hex form.
  *
  * @since 2.7.0
  * @access private
  * @ignore
  *
  * @param array $matches `preg_replace_callback()` matches array.
  * @return string Correctly encoded entity.
  */
 function wp_kses_normalize_entities3( $matches ) {
 	if ( empty( $matches[1] ) ) {
 		return '';
 	}
 
 	$hexchars = $matches[1];
 	return ( ! valid_unicode( hexdec( $hexchars ) ) ) ? "&amp;#x$hexchars;" : '&#x' . ltrim( $hexchars, '0' ) . ';';
 }
 
 /**
  * Determines if a Unicode codepoint is valid.
  *
  * @since 2.7.0
  *
  * @param int $i Unicode codepoint.
  * @return bool Whether or not the codepoint is a valid Unicode codepoint.
  */
 function valid_unicode( $i ) {
 	return ( 0x9 == $i || 0xa == $i || 0xd == $i ||
 			( 0x20 <= $i && $i <= 0xd7ff ) ||
 			( 0xe000 <= $i && $i <= 0xfffd ) ||
 			( 0x10000 <= $i && $i <= 0x10ffff ) );
 }
 
 /**
  * Converts all numeric HTML entities to their named counterparts.
  *
  * This function decodes numeric HTML entities (`&#65;` and `&#x41;`).
  * It doesn't do anything with named entities like `&auml;`, but we don't
  * need them in the allowed URL protocols system anyway.
  *
  * @since 1.0.0
  *
  * @param string $string Content to change entities.
  * @return string Content after decoded entities.
  */
 function wp_kses_decode_entities( $string ) {
 	$string = preg_replace_callback( '/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string );
 	$string = preg_replace_callback( '/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string );
 
 	return $string;
 }
 
 /**
  * Regex callback for `wp_kses_decode_entities()`.
  *
  * @since 2.9.0
  * @access private
  * @ignore
  *
  * @param array $match preg match
  * @return string
  */
 function _wp_kses_decode_entities_chr( $match ) {
 	return chr( $match[1] );
 }
 
 /**
  * Regex callback for `wp_kses_decode_entities()`.
  *
  * @since 2.9.0
  * @access private
  * @ignore
  *
  * @param array $match preg match
  * @return string
  */
 function _wp_kses_decode_entities_chr_hexdec( $match ) {
 	return chr( hexdec( $match[1] ) );
 }
 
 /**
  * Sanitize content with allowed HTML KSES rules.
  *
  * This function expects slashed data.
  *
  * @since 1.0.0
  *
  * @param string $data Content to filter, expected to be escaped with slashes.
  * @return string Filtered content.
  */
 function wp_filter_kses( $data ) {
 	return addslashes( wp_kses( stripslashes( $data ), current_filter() ) );
 }
 
 /**
  * Sanitize content with allowed HTML KSES rules.
  *
  * This function expects unslashed data.
  *
  * @since 2.9.0
  *
  * @param string $data Content to filter, expected to not be escaped.
  * @return string Filtered content.
  */
 function wp_kses_data( $data ) {
 	return wp_kses( $data, current_filter() );
 }
 
 /**
  * Sanitizes content for allowed HTML tags for post content.
  *
  * Post content refers to the page contents of the 'post' type and not `$_POST`
  * data from forms.
  *
  * This function expects slashed data.
  *
  * @since 2.0.0
  *
  * @param string $data Post content to filter, expected to be escaped with slashes.
  * @return string Filtered post content with allowed HTML tags and attributes intact.
  */
 function wp_filter_post_kses( $data ) {
 	return addslashes( wp_kses( stripslashes( $data ), 'post' ) );
 }
 
 /**
  * Sanitizes content for allowed HTML tags for post content.
  *
  * Post content refers to the page contents of the 'post' type and not `$_POST`
  * data from forms.
  *
  * This function expects unslashed data.
  *
  * @since 2.9.0
  *
  * @param string $data Post content to filter.
  * @return string Filtered post content with allowed HTML tags and attributes intact.
  */
 function wp_kses_post( $data ) {
 	return wp_kses( $data, 'post' );
 }
 
 /**
  * Navigates through an array, object, or scalar, and sanitizes content for
  * allowed HTML tags for post content.
  *
  * @since 4.4.2
  *
  * @see map_deep()
  *
  * @param mixed $data The array, object, or scalar value to inspect.
  * @return mixed The filtered content.
  */
 function wp_kses_post_deep( $data ) {
 	return map_deep( $data, 'wp_kses_post' );
 }
 
 /**
  * Strips all HTML from a text string.
  *
  * This function expects slashed data.
  *
  * @since 2.1.0
  *
  * @param string $data Content to strip all HTML from.
  * @return string Filtered content without any HTML.
  */
 function wp_filter_nohtml_kses( $data ) {
 	return addslashes( wp_kses( stripslashes( $data ), 'strip' ) );
 }
 
 /**
  * Adds all KSES input form content filters.
  *
  * All hooks have default priority. The `wp_filter_kses()` function is added to
  * the 'pre_comment_content' and 'title_save_pre' hooks.
  *
  * The `wp_filter_post_kses()` function is added to the 'content_save_pre',
  * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks.
  *
  * @since 2.0.0
  */
 function kses_init_filters() {
 	// Normal filtering.
 	add_filter( 'title_save_pre', 'wp_filter_kses' );
 
 	// Comment filtering.
 	if ( current_user_can( 'unfiltered_html' ) ) {
 		add_filter( 'pre_comment_content', 'wp_filter_post_kses' );
 	} else {
 		add_filter( 'pre_comment_content', 'wp_filter_kses' );
 	}
 
 	// Post filtering.
 	add_filter( 'content_save_pre', 'wp_filter_post_kses' );
 	add_filter( 'excerpt_save_pre', 'wp_filter_post_kses' );
 	add_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' );
 }
 
 /**
  * Removes all KSES input form content filters.
  *
  * A quick procedural method to removing all of the filters that KSES uses for
  * content in WordPress Loop.
  *
  * Does not remove the `kses_init()` function from {@see 'init'} hook (priority is
  * default). Also does not remove `kses_init()` function from {@see 'set_current_user'}
  * hook (priority is also default).
  *
  * @since 2.0.6
  */
 function kses_remove_filters() {
 	// Normal filtering.
 	remove_filter( 'title_save_pre', 'wp_filter_kses' );
 
 	// Comment filtering.
 	remove_filter( 'pre_comment_content', 'wp_filter_post_kses' );
 	remove_filter( 'pre_comment_content', 'wp_filter_kses' );
 
 	// Post filtering.
 	remove_filter( 'content_save_pre', 'wp_filter_post_kses' );
 	remove_filter( 'excerpt_save_pre', 'wp_filter_post_kses' );
 	remove_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' );
 }
 
 /**
  * Sets up most of the KSES filters for input form content.
  *
  * First removes all of the KSES filters in case the current user does not need
  * to have KSES filter the content. If the user does not have `unfiltered_html`
  * capability, then KSES filters are added.
  *
  * @since 2.0.0
  */
 function kses_init() {
 	kses_remove_filters();
 
 	if ( ! current_user_can( 'unfiltered_html' ) ) {
 		kses_init_filters();
 	}
 }
 
 /**
  * Filters an inline style attribute and removes disallowed rules.
  *
  * @since 2.8.1
  *
  * @param string $css        A string of CSS rules.
  * @param string $deprecated Not used.
  * @return string Filtered string of CSS rules.
  */
 function safecss_filter_attr( $css, $deprecated = '' ) {
 	if ( ! empty( $deprecated ) ) {
 		_deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented.
 	}
 
 	$css = wp_kses_no_null( $css );
 	$css = str_replace( array( "\n", "\r", "\t" ), '', $css );
 
 	$allowed_protocols = wp_allowed_protocols();
 
 	$css_array = explode( ';', trim( $css ) );
 
 	/**
 	 * Filters list of allowed CSS attributes.
 	 *
 	 * @since 2.8.1
 	 * @since 4.4.0 Added support for `min-height`, `max-height`, `min-width`, and `max-width`.
 	 * @since 4.6.0 Added support for `list-style-type`.
 	 * @since 5.0.0 Added support for `background-image`.
 	 * @since 5.1.0 Added support for `text-transform`.
 	 * @since 5.2.0 Added support for `background-position` and `grid-template-columns`.
 	 * @since 5.3.0 Added support for `grid`, `flex` and `column` layout properties.
 	 *              Extend `background-*` support of individual properties.
 	 * @since 5.3.1 Added support for gradient backgrounds.
 	 * @since 5.7.1 Added support for `object-position`.
 	 * @since 5.8.0 Added support for `calc()` and `var()` values.
 	 *
 	 * @param string[] $attr Array of allowed CSS attributes.
 	 */
 	$allowed_attr = apply_filters(
 		'safe_style_css',
 		array(
 			'background',
 			'background-color',
 			'background-image',
 			'background-position',
 			'background-size',
 			'background-attachment',
 			'background-blend-mode',
 
 			'border',
 			'border-radius',
 			'border-width',
 			'border-color',
 			'border-style',
 			'border-right',
 			'border-right-color',
 			'border-right-style',
 			'border-right-width',
 			'border-bottom',
 			'border-bottom-color',
 			'border-bottom-style',
 			'border-bottom-width',
 			'border-left',
 			'border-left-color',
 			'border-left-style',
 			'border-left-width',
 			'border-top',
 			'border-top-color',
 			'border-top-style',
 			'border-top-width',
 
 			'border-spacing',
 			'border-collapse',
 			'caption-side',
 
 			'columns',
 			'column-count',
 			'column-fill',
 			'column-gap',
 			'column-rule',
 			'column-span',
 			'column-width',
 
 			'color',
 			'font',
 			'font-family',
 			'font-size',
 			'font-style',
 			'font-variant',
 			'font-weight',
 			'letter-spacing',
 			'line-height',
 			'text-align',
 			'text-decoration',
 			'text-indent',
 			'text-transform',
 
 			'height',
 			'min-height',
 			'max-height',
 
 			'width',
 			'min-width',
 			'max-width',
 
 			'margin',
 			'margin-right',
 			'margin-bottom',
 			'margin-left',
 			'margin-top',
 
 			'padding',
 			'padding-right',
 			'padding-bottom',
 			'padding-left',
 			'padding-top',
 
 			'flex',
 			'flex-basis',
 			'flex-direction',
 			'flex-flow',
 			'flex-grow',
 			'flex-shrink',
 
 			'grid-template-columns',
 			'grid-auto-columns',
 			'grid-column-start',
 			'grid-column-end',
 			'grid-column-gap',
 			'grid-template-rows',
 			'grid-auto-rows',
 			'grid-row-start',
 			'grid-row-end',
 			'grid-row-gap',
 			'grid-gap',
 
 			'justify-content',
 			'justify-items',
 			'justify-self',
 			'align-content',
 			'align-items',
 			'align-self',
 
 			'clear',
 			'cursor',
 			'direction',
 			'float',
 			'list-style-type',
 			'object-position',
 			'overflow',
 			'vertical-align',
 		)
 	);
 
 	/*
 	 * CSS attributes that accept URL data types.
 	 *
 	 * This is in accordance to the CSS spec and unrelated to
 	 * the sub-set of supported attributes above.
 	 *
 	 * See: https://developer.mozilla.org/en-US/docs/Web/CSS/url
 	 */
 	$css_url_data_types = array(
 		'background',
 		'background-image',
 
 		'cursor',
 
 		'list-style',
 		'list-style-image',
 	);
 
 	/*
 	 * CSS attributes that accept gradient data types.
 	 *
 	 */
 	$css_gradient_data_types = array(
 		'background',
 		'background-image',
 	);
 
 	if ( empty( $allowed_attr ) ) {
 		return $css;
 	}
 
 	$css = '';
 	foreach ( $css_array as $css_item ) {
 		if ( '' === $css_item ) {
 			continue;
 		}
 
 		$css_item        = trim( $css_item );
 		$css_test_string = $css_item;
 		$found           = false;
 		$url_attr        = false;
 		$gradient_attr   = false;
 
 		if ( strpos( $css_item, ':' ) === false ) {
 			$found = true;
 		} else {
 			$parts        = explode( ':', $css_item, 2 );
 			$css_selector = trim( $parts[0] );
 
 			if ( in_array( $css_selector, $allowed_attr, true ) ) {
 				$found         = true;
 				$url_attr      = in_array( $css_selector, $css_url_data_types, true );
 				$gradient_attr = in_array( $css_selector, $css_gradient_data_types, true );
 			}
 		}
 
 		if ( $found && $url_attr ) {
 			// Simplified: matches the sequence `url(*)`.
 			preg_match_all( '/url\([^)]+\)/', $parts[1], $url_matches );
 
 			foreach ( $url_matches[0] as $url_match ) {
 				// Clean up the URL from each of the matches above.
 				preg_match( '/^url\(\s*([\'\"]?)(.*)(\g1)\s*\)$/', $url_match, $url_pieces );
 
 				if ( empty( $url_pieces[2] ) ) {
 					$found = false;
 					break;
 				}
 
 				$url = trim( $url_pieces[2] );
 
 				if ( empty( $url ) || wp_kses_bad_protocol( $url, $allowed_protocols ) !== $url ) {
 					$found = false;
 					break;
 				} else {
 					// Remove the whole `url(*)` bit that was matched above from the CSS.
 					$css_test_string = str_replace( $url_match, '', $css_test_string );
 				}
 			}
 		}
 
 		if ( $found && $gradient_attr ) {
 			$css_value = trim( $parts[1] );
 			if ( preg_match( '/^(repeating-)?(linear|radial|conic)-gradient\(([^()]|rgb[a]?\([^()]*\))*\)$/', $css_value ) ) {
 				// Remove the whole `gradient` bit that was matched above from the CSS.
 				$css_test_string = str_replace( $css_value, '', $css_test_string );
 			}
 		}
 
 		if ( $found ) {
 			// Allow CSS calc().
 			$css_test_string = preg_replace( '/calc\(((?:\([^()]*\)?|[^()])*)\)/', '', $css_test_string );
 			// Allow CSS var().
 			$css_test_string = preg_replace( '/\(?var\(--[a-zA-Z0-9_-]*\)/', '', $css_test_string );
 
 			// Check for any CSS containing \ ( & } = or comments,
 			// except for url(), calc(), or var() usage checked above.
 			$allow_css = ! preg_match( '%[\\\(&=}]|/\*%', $css_test_string );
 
 			/**
 			 * Filters the check for unsafe CSS in `safecss_filter_attr`.
 			 *
 			 * Enables developers to determine whether a section of CSS should be allowed or discarded.
 			 * By default, the value will be false if the part contains \ ( & } = or comments.
 			 * Return true to allow the CSS part to be included in the output.
 			 *
 			 * @since 5.5.0
 			 *
 			 * @param bool   $allow_css       Whether the CSS in the test string is considered safe.
 			 * @param string $css_test_string The CSS string to test.
 			 */
 			$allow_css = apply_filters( 'safecss_filter_attr_allow_css', $allow_css, $css_test_string );
 
 			 // Only add the CSS part if it passes the regex check.
 			if ( $allow_css ) {
 				if ( '' !== $css ) {
 					$css .= ';';
 				}
 
 				$css .= $css_item;
 			}
 		}
 	}
 
 	return $css;
 }
 
 /**
  * Helper function to add global attributes to a tag in the allowed HTML list.
  *
  * @since 3.5.0
  * @since 5.0.0 Add support for `data-*` wildcard attributes.
  * @access private
  * @ignore
  *
  * @param array $value An array of attributes.
  * @return array The array of attributes with global attributes added.
  */
 function _wp_add_global_attributes( $value ) {
 	$global_attributes = array(
 		'aria-describedby' => true,
 		'aria-details'     => true,
 		'aria-label'       => true,
 		'aria-labelledby'  => true,
 		'aria-hidden'      => true,
 		'class'            => true,
 		'id'               => true,
 		'style'            => true,
 		'title'            => true,
 		'role'             => true,
 		'data-*'           => true,
 	);
 
 	if ( true === $value ) {
 		$value = array();
 	}
 
 	if ( is_array( $value ) ) {
 		return array_merge( $value, $global_attributes );
 	}
 
 	return $value;
 }