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class-wp-rewrite.php (62847B)

---

 <?php
 /**
  * Rewrite API: WP_Rewrite class
  *
  * @package WordPress
  * @subpackage Rewrite
  * @since 1.5.0
  */
 
 /**
  * Core class used to implement a rewrite component API.
  *
  * The WordPress Rewrite class writes the rewrite module rules to the .htaccess
  * file. It also handles parsing the request to get the correct setup for the
  * WordPress Query class.
  *
  * The Rewrite along with WP class function as a front controller for WordPress.
  * You can add rules to trigger your page view and processing using this
  * component. The full functionality of a front controller does not exist,
  * meaning you can't define how the template files load based on the rewrite
  * rules.
  *
  * @since 1.5.0
  */
 class WP_Rewrite {
 	/**
 	 * Permalink structure for posts.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $permalink_structure;
 
 	/**
 	 * Whether to add trailing slashes.
 	 *
 	 * @since 2.2.0
 	 * @var bool
 	 */
 	public $use_trailing_slashes;
 
 	/**
 	 * Base for the author permalink structure (example.com/$author_base/authorname).
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $author_base = 'author';
 
 	/**
 	 * Permalink structure for author archives.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $author_structure;
 
 	/**
 	 * Permalink structure for date archives.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $date_structure;
 
 	/**
 	 * Permalink structure for pages.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $page_structure;
 
 	/**
 	 * Base of the search permalink structure (example.com/$search_base/query).
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $search_base = 'search';
 
 	/**
 	 * Permalink structure for searches.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $search_structure;
 
 	/**
 	 * Comments permalink base.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $comments_base = 'comments';
 
 	/**
 	 * Pagination permalink base.
 	 *
 	 * @since 3.1.0
 	 * @var string
 	 */
 	public $pagination_base = 'page';
 
 	/**
 	 * Comments pagination permalink base.
 	 *
 	 * @since 4.2.0
 	 * @var string
 	 */
 	public $comments_pagination_base = 'comment-page';
 
 	/**
 	 * Feed permalink base.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $feed_base = 'feed';
 
 	/**
 	 * Comments feed permalink structure.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $comment_feed_structure;
 
 	/**
 	 * Feed request permalink structure.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $feed_structure;
 
 	/**
 	 * The static portion of the post permalink structure.
 	 *
 	 * If the permalink structure is "/archive/%post_id%" then the front
 	 * is "/archive/". If the permalink structure is "/%year%/%postname%/"
 	 * then the front is "/".
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 *
 	 * @see WP_Rewrite::init()
 	 */
 	public $front;
 
 	/**
 	 * The prefix for all permalink structures.
 	 *
 	 * If PATHINFO/index permalinks are in use then the root is the value of
 	 * `WP_Rewrite::$index` with a trailing slash appended. Otherwise the root
 	 * will be empty.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 *
 	 * @see WP_Rewrite::init()
 	 * @see WP_Rewrite::using_index_permalinks()
 	 */
 	public $root = '';
 
 	/**
 	 * The name of the index file which is the entry point to all requests.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $index = 'index.php';
 
 	/**
 	 * Variable name to use for regex matches in the rewritten query.
 	 *
 	 * @since 1.5.0
 	 * @var string
 	 */
 	public $matches = '';
 
 	/**
 	 * Rewrite rules to match against the request to find the redirect or query.
 	 *
 	 * @since 1.5.0
 	 * @var array
 	 */
 	public $rules;
 
 	/**
 	 * Additional rules added external to the rewrite class.
 	 *
 	 * Those not generated by the class, see add_rewrite_rule().
 	 *
 	 * @since 2.1.0
 	 * @var array
 	 */
 	public $extra_rules = array();
 
 	/**
 	 * Additional rules that belong at the beginning to match first.
 	 *
 	 * Those not generated by the class, see add_rewrite_rule().
 	 *
 	 * @since 2.3.0
 	 * @var array
 	 */
 	public $extra_rules_top = array();
 
 	/**
 	 * Rules that don't redirect to WordPress' index.php.
 	 *
 	 * These rules are written to the mod_rewrite portion of the .htaccess,
 	 * and are added by add_external_rule().
 	 *
 	 * @since 2.1.0
 	 * @var array
 	 */
 	public $non_wp_rules = array();
 
 	/**
 	 * Extra permalink structures, e.g. categories, added by add_permastruct().
 	 *
 	 * @since 2.1.0
 	 * @var array
 	 */
 	public $extra_permastructs = array();
 
 	/**
 	 * Endpoints (like /trackback/) added by add_rewrite_endpoint().
 	 *
 	 * @since 2.1.0
 	 * @var array
 	 */
 	public $endpoints;
 
 	/**
 	 * Whether to write every mod_rewrite rule for WordPress into the .htaccess file.
 	 *
 	 * This is off by default, turning it on might print a lot of rewrite rules
 	 * to the .htaccess file.
 	 *
 	 * @since 2.0.0
 	 * @var bool
 	 *
 	 * @see WP_Rewrite::mod_rewrite_rules()
 	 */
 	public $use_verbose_rules = false;
 
 	/**
 	 * Could post permalinks be confused with those of pages?
 	 *
 	 * If the first rewrite tag in the post permalink structure is one that could
 	 * also match a page name (e.g. %postname% or %author%) then this flag is
 	 * set to true. Prior to WordPress 3.3 this flag indicated that every page
 	 * would have a set of rules added to the top of the rewrite rules array.
 	 * Now it tells WP::parse_request() to check if a URL matching the page
 	 * permastruct is actually a page before accepting it.
 	 *
 	 * @since 2.5.0
 	 * @var bool
 	 *
 	 * @see WP_Rewrite::init()
 	 */
 	public $use_verbose_page_rules = true;
 
 	/**
 	 * Rewrite tags that can be used in permalink structures.
 	 *
 	 * These are translated into the regular expressions stored in
 	 * `WP_Rewrite::$rewritereplace` and are rewritten to the query
 	 * variables listed in WP_Rewrite::$queryreplace.
 	 *
 	 * Additional tags can be added with add_rewrite_tag().
 	 *
 	 * @since 1.5.0
 	 * @var array
 	 */
 	public $rewritecode = array(
 		'%year%',
 		'%monthnum%',
 		'%day%',
 		'%hour%',
 		'%minute%',
 		'%second%',
 		'%postname%',
 		'%post_id%',
 		'%author%',
 		'%pagename%',
 		'%search%',
 	);
 
 	/**
 	 * Regular expressions to be substituted into rewrite rules in place
 	 * of rewrite tags, see WP_Rewrite::$rewritecode.
 	 *
 	 * @since 1.5.0
 	 * @var array
 	 */
 	public $rewritereplace = array(
 		'([0-9]{4})',
 		'([0-9]{1,2})',
 		'([0-9]{1,2})',
 		'([0-9]{1,2})',
 		'([0-9]{1,2})',
 		'([0-9]{1,2})',
 		'([^/]+)',
 		'([0-9]+)',
 		'([^/]+)',
 		'([^/]+?)',
 		'(.+)',
 	);
 
 	/**
 	 * Query variables that rewrite tags map to, see WP_Rewrite::$rewritecode.
 	 *
 	 * @since 1.5.0
 	 * @var array
 	 */
 	public $queryreplace = array(
 		'year=',
 		'monthnum=',
 		'day=',
 		'hour=',
 		'minute=',
 		'second=',
 		'name=',
 		'p=',
 		'author_name=',
 		'pagename=',
 		's=',
 	);
 
 	/**
 	 * Supported default feeds.
 	 *
 	 * @since 1.5.0
 	 * @var array
 	 */
 	public $feeds = array( 'feed', 'rdf', 'rss', 'rss2', 'atom' );
 
 	/**
 	 * Determines whether permalinks are being used.
 	 *
 	 * This can be either rewrite module or permalink in the HTTP query string.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return bool True, if permalinks are enabled.
 	 */
 	public function using_permalinks() {
 		return ! empty( $this->permalink_structure );
 	}
 
 	/**
 	 * Determines whether permalinks are being used and rewrite module is not enabled.
 	 *
 	 * Means that permalink links are enabled and index.php is in the URL.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return bool Whether permalink links are enabled and index.php is in the URL.
 	 */
 	public function using_index_permalinks() {
 		if ( empty( $this->permalink_structure ) ) {
 			return false;
 		}
 
 		// If the index is not in the permalink, we're using mod_rewrite.
 		return preg_match( '#^/*' . $this->index . '#', $this->permalink_structure );
 	}
 
 	/**
 	 * Determines whether permalinks are being used and rewrite module is enabled.
 	 *
 	 * Using permalinks and index.php is not in the URL.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return bool Whether permalink links are enabled and index.php is NOT in the URL.
 	 */
 	public function using_mod_rewrite_permalinks() {
 		return $this->using_permalinks() && ! $this->using_index_permalinks();
 	}
 
 	/**
 	 * Indexes for matches for usage in preg_*() functions.
 	 *
 	 * The format of the string is, with empty matches property value, '$NUM'.
 	 * The 'NUM' will be replaced with the value in the $number parameter. With
 	 * the matches property not empty, the value of the returned string will
 	 * contain that value of the matches property. The format then will be
 	 * '$MATCHES[NUM]', with MATCHES as the value in the property and NUM the
 	 * value of the $number parameter.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @param int $number Index number.
 	 * @return string
 	 */
 	public function preg_index( $number ) {
 		$match_prefix = '$';
 		$match_suffix = '';
 
 		if ( ! empty( $this->matches ) ) {
 			$match_prefix = '$' . $this->matches . '[';
 			$match_suffix = ']';
 		}
 
 		return "$match_prefix$number$match_suffix";
 	}
 
 	/**
 	 * Retrieves all page and attachments for pages URIs.
 	 *
 	 * The attachments are for those that have pages as parents and will be
 	 * retrieved.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
 	 * @return array Array of page URIs as first element and attachment URIs as second element.
 	 */
 	public function page_uri_index() {
 		global $wpdb;
 
 		// Get pages in order of hierarchy, i.e. children after parents.
 		$pages = $wpdb->get_results( "SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'page' AND post_status != 'auto-draft'" );
 		$posts = get_page_hierarchy( $pages );
 
 		// If we have no pages get out quick.
 		if ( ! $posts ) {
 			return array( array(), array() );
 		}
 
 		// Now reverse it, because we need parents after children for rewrite rules to work properly.
 		$posts = array_reverse( $posts, true );
 
 		$page_uris            = array();
 		$page_attachment_uris = array();
 
 		foreach ( $posts as $id => $post ) {
 			// URL => page name.
 			$uri         = get_page_uri( $id );
 			$attachments = $wpdb->get_results( $wpdb->prepare( "SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'attachment' AND post_parent = %d", $id ) );
 			if ( ! empty( $attachments ) ) {
 				foreach ( $attachments as $attachment ) {
 					$attach_uri                          = get_page_uri( $attachment->ID );
 					$page_attachment_uris[ $attach_uri ] = $attachment->ID;
 				}
 			}
 
 			$page_uris[ $uri ] = $id;
 		}
 
 		return array( $page_uris, $page_attachment_uris );
 	}
 
 	/**
 	 * Retrieves all of the rewrite rules for pages.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string[] Page rewrite rules.
 	 */
 	public function page_rewrite_rules() {
 		// The extra .? at the beginning prevents clashes with other regular expressions in the rules array.
 		$this->add_rewrite_tag( '%pagename%', '(.?.+?)', 'pagename=' );
 
 		return $this->generate_rewrite_rules( $this->get_page_permastruct(), EP_PAGES, true, true, false, false );
 	}
 
 	/**
 	 * Retrieves date permalink structure, with year, month, and day.
 	 *
 	 * The permalink structure for the date, if not set already depends on the
 	 * permalink structure. It can be one of three formats. The first is year,
 	 * month, day; the second is day, month, year; and the last format is month,
 	 * day, year. These are matched against the permalink structure for which
 	 * one is used. If none matches, then the default will be used, which is
 	 * year, month, day.
 	 *
 	 * Prevents post ID and date permalinks from overlapping. In the case of
 	 * post_id, the date permalink will be prepended with front permalink with
 	 * 'date/' before the actual permalink to form the complete date permalink
 	 * structure.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Date permalink structure on success, false on failure.
 	 */
 	public function get_date_permastruct() {
 		if ( isset( $this->date_structure ) ) {
 			return $this->date_structure;
 		}
 
 		if ( empty( $this->permalink_structure ) ) {
 			$this->date_structure = '';
 			return false;
 		}
 
 		// The date permalink must have year, month, and day separated by slashes.
 		$endians = array( '%year%/%monthnum%/%day%', '%day%/%monthnum%/%year%', '%monthnum%/%day%/%year%' );
 
 		$this->date_structure = '';
 		$date_endian          = '';
 
 		foreach ( $endians as $endian ) {
 			if ( false !== strpos( $this->permalink_structure, $endian ) ) {
 				$date_endian = $endian;
 				break;
 			}
 		}
 
 		if ( empty( $date_endian ) ) {
 			$date_endian = '%year%/%monthnum%/%day%';
 		}
 
 		/*
 		 * Do not allow the date tags and %post_id% to overlap in the permalink
 		 * structure. If they do, move the date tags to $front/date/.
 		 */
 		$front = $this->front;
 		preg_match_all( '/%.+?%/', $this->permalink_structure, $tokens );
 		$tok_index = 1;
 		foreach ( (array) $tokens[0] as $token ) {
 			if ( '%post_id%' === $token && ( $tok_index <= 3 ) ) {
 				$front = $front . 'date/';
 				break;
 			}
 			$tok_index++;
 		}
 
 		$this->date_structure = $front . $date_endian;
 
 		return $this->date_structure;
 	}
 
 	/**
 	 * Retrieves the year permalink structure without month and day.
 	 *
 	 * Gets the date permalink structure and strips out the month and day
 	 * permalink structures.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Year permalink structure on success, false on failure.
 	 */
 	public function get_year_permastruct() {
 		$structure = $this->get_date_permastruct();
 
 		if ( empty( $structure ) ) {
 			return false;
 		}
 
 		$structure = str_replace( '%monthnum%', '', $structure );
 		$structure = str_replace( '%day%', '', $structure );
 		$structure = preg_replace( '#/+#', '/', $structure );
 
 		return $structure;
 	}
 
 	/**
 	 * Retrieves the month permalink structure without day and with year.
 	 *
 	 * Gets the date permalink structure and strips out the day permalink
 	 * structures. Keeps the year permalink structure.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Year/Month permalink structure on success, false on failure.
 	 */
 	public function get_month_permastruct() {
 		$structure = $this->get_date_permastruct();
 
 		if ( empty( $structure ) ) {
 			return false;
 		}
 
 		$structure = str_replace( '%day%', '', $structure );
 		$structure = preg_replace( '#/+#', '/', $structure );
 
 		return $structure;
 	}
 
 	/**
 	 * Retrieves the day permalink structure with month and year.
 	 *
 	 * Keeps date permalink structure with all year, month, and day.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Year/Month/Day permalink structure on success, false on failure.
 	 */
 	public function get_day_permastruct() {
 		return $this->get_date_permastruct();
 	}
 
 	/**
 	 * Retrieves the permalink structure for categories.
 	 *
 	 * If the category_base property has no value, then the category structure
 	 * will have the front property value, followed by 'category', and finally
 	 * '%category%'. If it does, then the root property will be used, along with
 	 * the category_base property value.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Category permalink structure on success, false on failure.
 	 */
 	public function get_category_permastruct() {
 		return $this->get_extra_permastruct( 'category' );
 	}
 
 	/**
 	 * Retrieve the permalink structure for tags.
 	 *
 	 * If the tag_base property has no value, then the tag structure will have
 	 * the front property value, followed by 'tag', and finally '%tag%'. If it
 	 * does, then the root property will be used, along with the tag_base
 	 * property value.
 	 *
 	 * @since 2.3.0
 	 *
 	 * @return string|false Tag permalink structure on success, false on failure.
 	 */
 	public function get_tag_permastruct() {
 		return $this->get_extra_permastruct( 'post_tag' );
 	}
 
 	/**
 	 * Retrieves an extra permalink structure by name.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @param string $name Permalink structure name.
 	 * @return string|false Permalink structure string on success, false on failure.
 	 */
 	public function get_extra_permastruct( $name ) {
 		if ( empty( $this->permalink_structure ) ) {
 			return false;
 		}
 
 		if ( isset( $this->extra_permastructs[ $name ] ) ) {
 			return $this->extra_permastructs[ $name ]['struct'];
 		}
 
 		return false;
 	}
 
 	/**
 	 * Retrieves the author permalink structure.
 	 *
 	 * The permalink structure is front property, author base, and finally
 	 * '/%author%'. Will set the author_structure property and then return it
 	 * without attempting to set the value again.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Author permalink structure on success, false on failure.
 	 */
 	public function get_author_permastruct() {
 		if ( isset( $this->author_structure ) ) {
 			return $this->author_structure;
 		}
 
 		if ( empty( $this->permalink_structure ) ) {
 			$this->author_structure = '';
 			return false;
 		}
 
 		$this->author_structure = $this->front . $this->author_base . '/%author%';
 
 		return $this->author_structure;
 	}
 
 	/**
 	 * Retrieves the search permalink structure.
 	 *
 	 * The permalink structure is root property, search base, and finally
 	 * '/%search%'. Will set the search_structure property and then return it
 	 * without attempting to set the value again.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Search permalink structure on success, false on failure.
 	 */
 	public function get_search_permastruct() {
 		if ( isset( $this->search_structure ) ) {
 			return $this->search_structure;
 		}
 
 		if ( empty( $this->permalink_structure ) ) {
 			$this->search_structure = '';
 			return false;
 		}
 
 		$this->search_structure = $this->root . $this->search_base . '/%search%';
 
 		return $this->search_structure;
 	}
 
 	/**
 	 * Retrieves the page permalink structure.
 	 *
 	 * The permalink structure is root property, and '%pagename%'. Will set the
 	 * page_structure property and then return it without attempting to set the
 	 * value again.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Page permalink structure on success, false on failure.
 	 */
 	public function get_page_permastruct() {
 		if ( isset( $this->page_structure ) ) {
 			return $this->page_structure;
 		}
 
 		if ( empty( $this->permalink_structure ) ) {
 			$this->page_structure = '';
 			return false;
 		}
 
 		$this->page_structure = $this->root . '%pagename%';
 
 		return $this->page_structure;
 	}
 
 	/**
 	 * Retrieves the feed permalink structure.
 	 *
 	 * The permalink structure is root property, feed base, and finally
 	 * '/%feed%'. Will set the feed_structure property and then return it
 	 * without attempting to set the value again.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Feed permalink structure on success, false on failure.
 	 */
 	public function get_feed_permastruct() {
 		if ( isset( $this->feed_structure ) ) {
 			return $this->feed_structure;
 		}
 
 		if ( empty( $this->permalink_structure ) ) {
 			$this->feed_structure = '';
 			return false;
 		}
 
 		$this->feed_structure = $this->root . $this->feed_base . '/%feed%';
 
 		return $this->feed_structure;
 	}
 
 	/**
 	 * Retrieves the comment feed permalink structure.
 	 *
 	 * The permalink structure is root property, comment base property, feed
 	 * base and finally '/%feed%'. Will set the comment_feed_structure property
 	 * and then return it without attempting to set the value again.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string|false Comment feed permalink structure on success, false on failure.
 	 */
 	public function get_comment_feed_permastruct() {
 		if ( isset( $this->comment_feed_structure ) ) {
 			return $this->comment_feed_structure;
 		}
 
 		if ( empty( $this->permalink_structure ) ) {
 			$this->comment_feed_structure = '';
 			return false;
 		}
 
 		$this->comment_feed_structure = $this->root . $this->comments_base . '/' . $this->feed_base . '/%feed%';
 
 		return $this->comment_feed_structure;
 	}
 
 	/**
 	 * Adds or updates existing rewrite tags (e.g. %postname%).
 	 *
 	 * If the tag already exists, replace the existing pattern and query for
 	 * that tag, otherwise add the new tag.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @see WP_Rewrite::$rewritecode
 	 * @see WP_Rewrite::$rewritereplace
 	 * @see WP_Rewrite::$queryreplace
 	 *
 	 * @param string $tag   Name of the rewrite tag to add or update.
 	 * @param string $regex Regular expression to substitute the tag for in rewrite rules.
 	 * @param string $query String to append to the rewritten query. Must end in '='.
 	 */
 	public function add_rewrite_tag( $tag, $regex, $query ) {
 		$position = array_search( $tag, $this->rewritecode, true );
 		if ( false !== $position && null !== $position ) {
 			$this->rewritereplace[ $position ] = $regex;
 			$this->queryreplace[ $position ]   = $query;
 		} else {
 			$this->rewritecode[]    = $tag;
 			$this->rewritereplace[] = $regex;
 			$this->queryreplace[]   = $query;
 		}
 	}
 
 
 	/**
 	 * Removes an existing rewrite tag.
 	 *
 	 * @since 4.5.0
 	 *
 	 * @see WP_Rewrite::$rewritecode
 	 * @see WP_Rewrite::$rewritereplace
 	 * @see WP_Rewrite::$queryreplace
 	 *
 	 * @param string $tag Name of the rewrite tag to remove.
 	 */
 	public function remove_rewrite_tag( $tag ) {
 		$position = array_search( $tag, $this->rewritecode, true );
 		if ( false !== $position && null !== $position ) {
 			unset( $this->rewritecode[ $position ] );
 			unset( $this->rewritereplace[ $position ] );
 			unset( $this->queryreplace[ $position ] );
 		}
 	}
 
 	/**
 	 * Generates rewrite rules from a permalink structure.
 	 *
 	 * The main WP_Rewrite function for building the rewrite rule list. The
 	 * contents of the function is a mix of black magic and regular expressions,
 	 * so best just ignore the contents and move to the parameters.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @param string $permalink_structure The permalink structure.
 	 * @param int    $ep_mask             Optional. Endpoint mask defining what endpoints are added to the structure.
 	 *                                    Accepts a mask of:
 	 *                                    - `EP_ALL`
 	 *                                    - `EP_NONE`
 	 *                                    - `EP_ALL_ARCHIVES`
 	 *                                    - `EP_ATTACHMENT`
 	 *                                    - `EP_AUTHORS`
 	 *                                    - `EP_CATEGORIES`
 	 *                                    - `EP_COMMENTS`
 	 *                                    - `EP_DATE`
 	 *                                    - `EP_DAY`
 	 *                                    - `EP_MONTH`
 	 *                                    - `EP_PAGES`
 	 *                                    - `EP_PERMALINK`
 	 *                                    - `EP_ROOT`
 	 *                                    - `EP_SEARCH`
 	 *                                    - `EP_TAGS`
 	 *                                    - `EP_YEAR`
 	 *                                    Default `EP_NONE`.
 	 * @param bool   $paged               Optional. Whether archive pagination rules should be added for the structure.
 	 *                                    Default true.
 	 * @param bool   $feed                Optional Whether feed rewrite rules should be added for the structure.
 	 *                                    Default true.
 	 * @param bool   $forcomments         Optional. Whether the feed rules should be a query for a comments feed.
 	 *                                    Default false.
 	 * @param bool   $walk_dirs           Optional. Whether the 'directories' making up the structure should be walked
 	 *                                    over and rewrite rules built for each in-turn. Default true.
 	 * @param bool   $endpoints           Optional. Whether endpoints should be applied to the generated rewrite rules.
 	 *                                    Default true.
 	 * @return string[] Array of rewrite rules keyed by their regex pattern.
 	 */
 	public function generate_rewrite_rules( $permalink_structure, $ep_mask = EP_NONE, $paged = true, $feed = true, $forcomments = false, $walk_dirs = true, $endpoints = true ) {
 		// Build a regex to match the feed section of URLs, something like (feed|atom|rss|rss2)/?
 		$feedregex2 = '';
 		foreach ( (array) $this->feeds as $feed_name ) {
 			$feedregex2 .= $feed_name . '|';
 		}
 		$feedregex2 = '(' . trim( $feedregex2, '|' ) . ')/?$';
 
 		/*
 		 * $feedregex is identical but with /feed/ added on as well, so URLs like <permalink>/feed/atom
 		 * and <permalink>/atom are both possible
 		 */
 		$feedregex = $this->feed_base . '/' . $feedregex2;
 
 		// Build a regex to match the trackback and page/xx parts of URLs.
 		$trackbackregex = 'trackback/?$';
 		$pageregex      = $this->pagination_base . '/?([0-9]{1,})/?$';
 		$commentregex   = $this->comments_pagination_base . '-([0-9]{1,})/?$';
 		$embedregex     = 'embed/?$';
 
 		// Build up an array of endpoint regexes to append => queries to append.
 		if ( $endpoints ) {
 			$ep_query_append = array();
 			foreach ( (array) $this->endpoints as $endpoint ) {
 				// Match everything after the endpoint name, but allow for nothing to appear there.
 				$epmatch = $endpoint[1] . '(/(.*))?/?$';
 
 				// This will be appended on to the rest of the query for each dir.
 				$epquery                     = '&' . $endpoint[2] . '=';
 				$ep_query_append[ $epmatch ] = array( $endpoint[0], $epquery );
 			}
 		}
 
 		// Get everything up to the first rewrite tag.
 		$front = substr( $permalink_structure, 0, strpos( $permalink_structure, '%' ) );
 
 		// Build an array of the tags (note that said array ends up being in $tokens[0]).
 		preg_match_all( '/%.+?%/', $permalink_structure, $tokens );
 
 		$num_tokens = count( $tokens[0] );
 
 		$index          = $this->index; // Probably 'index.php'.
 		$feedindex      = $index;
 		$trackbackindex = $index;
 		$embedindex     = $index;
 
 		/*
 		 * Build a list from the rewritecode and queryreplace arrays, that will look something
 		 * like tagname=$matches[i] where i is the current $i.
 		 */
 		$queries = array();
 		for ( $i = 0; $i < $num_tokens; ++$i ) {
 			if ( 0 < $i ) {
 				$queries[ $i ] = $queries[ $i - 1 ] . '&';
 			} else {
 				$queries[ $i ] = '';
 			}
 
 			$query_token    = str_replace( $this->rewritecode, $this->queryreplace, $tokens[0][ $i ] ) . $this->preg_index( $i + 1 );
 			$queries[ $i ] .= $query_token;
 		}
 
 		// Get the structure, minus any cruft (stuff that isn't tags) at the front.
 		$structure = $permalink_structure;
 		if ( '/' !== $front ) {
 			$structure = str_replace( $front, '', $structure );
 		}
 
 		/*
 		 * Create a list of dirs to walk over, making rewrite rules for each level
 		 * so for example, a $structure of /%year%/%monthnum%/%postname% would create
 		 * rewrite rules for /%year%/, /%year%/%monthnum%/ and /%year%/%monthnum%/%postname%
 		 */
 		$structure = trim( $structure, '/' );
 		$dirs      = $walk_dirs ? explode( '/', $structure ) : array( $structure );
 		$num_dirs  = count( $dirs );
 
 		// Strip slashes from the front of $front.
 		$front = preg_replace( '|^/+|', '', $front );
 
 		// The main workhorse loop.
 		$post_rewrite = array();
 		$struct       = $front;
 		for ( $j = 0; $j < $num_dirs; ++$j ) {
 			// Get the struct for this dir, and trim slashes off the front.
 			$struct .= $dirs[ $j ] . '/'; // Accumulate. see comment near explode('/', $structure) above.
 			$struct  = ltrim( $struct, '/' );
 
 			// Replace tags with regexes.
 			$match = str_replace( $this->rewritecode, $this->rewritereplace, $struct );
 
 			// Make a list of tags, and store how many there are in $num_toks.
 			$num_toks = preg_match_all( '/%.+?%/', $struct, $toks );
 
 			// Get the 'tagname=$matches[i]'.
 			$query = ( ! empty( $num_toks ) && isset( $queries[ $num_toks - 1 ] ) ) ? $queries[ $num_toks - 1 ] : '';
 
 			// Set up $ep_mask_specific which is used to match more specific URL types.
 			switch ( $dirs[ $j ] ) {
 				case '%year%':
 					$ep_mask_specific = EP_YEAR;
 					break;
 				case '%monthnum%':
 					$ep_mask_specific = EP_MONTH;
 					break;
 				case '%day%':
 					$ep_mask_specific = EP_DAY;
 					break;
 				default:
 					$ep_mask_specific = EP_NONE;
 			}
 
 			// Create query for /page/xx.
 			$pagematch = $match . $pageregex;
 			$pagequery = $index . '?' . $query . '&paged=' . $this->preg_index( $num_toks + 1 );
 
 			// Create query for /comment-page-xx.
 			$commentmatch = $match . $commentregex;
 			$commentquery = $index . '?' . $query . '&cpage=' . $this->preg_index( $num_toks + 1 );
 
 			if ( get_option( 'page_on_front' ) ) {
 				// Create query for Root /comment-page-xx.
 				$rootcommentmatch = $match . $commentregex;
 				$rootcommentquery = $index . '?' . $query . '&page_id=' . get_option( 'page_on_front' ) . '&cpage=' . $this->preg_index( $num_toks + 1 );
 			}
 
 			// Create query for /feed/(feed|atom|rss|rss2|rdf).
 			$feedmatch = $match . $feedregex;
 			$feedquery = $feedindex . '?' . $query . '&feed=' . $this->preg_index( $num_toks + 1 );
 
 			// Create query for /(feed|atom|rss|rss2|rdf) (see comment near creation of $feedregex).
 			$feedmatch2 = $match . $feedregex2;
 			$feedquery2 = $feedindex . '?' . $query . '&feed=' . $this->preg_index( $num_toks + 1 );
 
 			// Create query and regex for embeds.
 			$embedmatch = $match . $embedregex;
 			$embedquery = $embedindex . '?' . $query . '&embed=true';
 
 			// If asked to, turn the feed queries into comment feed ones.
 			if ( $forcomments ) {
 				$feedquery  .= '&withcomments=1';
 				$feedquery2 .= '&withcomments=1';
 			}
 
 			// Start creating the array of rewrites for this dir.
 			$rewrite = array();
 
 			// ...adding on /feed/ regexes => queries.
 			if ( $feed ) {
 				$rewrite = array(
 					$feedmatch  => $feedquery,
 					$feedmatch2 => $feedquery2,
 					$embedmatch => $embedquery,
 				);
 			}
 
 			// ...and /page/xx ones.
 			if ( $paged ) {
 				$rewrite = array_merge( $rewrite, array( $pagematch => $pagequery ) );
 			}
 
 			// Only on pages with comments add ../comment-page-xx/.
 			if ( EP_PAGES & $ep_mask || EP_PERMALINK & $ep_mask ) {
 				$rewrite = array_merge( $rewrite, array( $commentmatch => $commentquery ) );
 			} elseif ( EP_ROOT & $ep_mask && get_option( 'page_on_front' ) ) {
 				$rewrite = array_merge( $rewrite, array( $rootcommentmatch => $rootcommentquery ) );
 			}
 
 			// Do endpoints.
 			if ( $endpoints ) {
 				foreach ( (array) $ep_query_append as $regex => $ep ) {
 					// Add the endpoints on if the mask fits.
 					if ( $ep[0] & $ep_mask || $ep[0] & $ep_mask_specific ) {
 						$rewrite[ $match . $regex ] = $index . '?' . $query . $ep[1] . $this->preg_index( $num_toks + 2 );
 					}
 				}
 			}
 
 			// If we've got some tags in this dir.
 			if ( $num_toks ) {
 				$post = false;
 				$page = false;
 
 				/*
 				 * Check to see if this dir is permalink-level: i.e. the structure specifies an
 				 * individual post. Do this by checking it contains at least one of 1) post name,
 				 * 2) post ID, 3) page name, 4) timestamp (year, month, day, hour, second and
 				 * minute all present). Set these flags now as we need them for the endpoints.
 				 */
 				if ( strpos( $struct, '%postname%' ) !== false
 						|| strpos( $struct, '%post_id%' ) !== false
 						|| strpos( $struct, '%pagename%' ) !== false
 						|| ( strpos( $struct, '%year%' ) !== false && strpos( $struct, '%monthnum%' ) !== false && strpos( $struct, '%day%' ) !== false && strpos( $struct, '%hour%' ) !== false && strpos( $struct, '%minute%' ) !== false && strpos( $struct, '%second%' ) !== false )
 						) {
 					$post = true;
 					if ( strpos( $struct, '%pagename%' ) !== false ) {
 						$page = true;
 					}
 				}
 
 				if ( ! $post ) {
 					// For custom post types, we need to add on endpoints as well.
 					foreach ( get_post_types( array( '_builtin' => false ) ) as $ptype ) {
 						if ( strpos( $struct, "%$ptype%" ) !== false ) {
 							$post = true;
 
 							// This is for page style attachment URLs.
 							$page = is_post_type_hierarchical( $ptype );
 							break;
 						}
 					}
 				}
 
 				// If creating rules for a permalink, do all the endpoints like attachments etc.
 				if ( $post ) {
 					// Create query and regex for trackback.
 					$trackbackmatch = $match . $trackbackregex;
 					$trackbackquery = $trackbackindex . '?' . $query . '&tb=1';
 
 					// Create query and regex for embeds.
 					$embedmatch = $match . $embedregex;
 					$embedquery = $embedindex . '?' . $query . '&embed=true';
 
 					// Trim slashes from the end of the regex for this dir.
 					$match = rtrim( $match, '/' );
 
 					// Get rid of brackets.
 					$submatchbase = str_replace( array( '(', ')' ), '', $match );
 
 					// Add a rule for at attachments, which take the form of <permalink>/some-text.
 					$sub1 = $submatchbase . '/([^/]+)/';
 
 					// Add trackback regex <permalink>/trackback/...
 					$sub1tb = $sub1 . $trackbackregex;
 
 					// And <permalink>/feed/(atom|...)
 					$sub1feed = $sub1 . $feedregex;
 
 					// And <permalink>/(feed|atom...)
 					$sub1feed2 = $sub1 . $feedregex2;
 
 					// And <permalink>/comment-page-xx
 					$sub1comment = $sub1 . $commentregex;
 
 					// And <permalink>/embed/...
 					$sub1embed = $sub1 . $embedregex;
 
 					/*
 					 * Add another rule to match attachments in the explicit form:
 					 * <permalink>/attachment/some-text
 					 */
 					$sub2 = $submatchbase . '/attachment/([^/]+)/';
 
 					// And add trackbacks <permalink>/attachment/trackback.
 					$sub2tb = $sub2 . $trackbackregex;
 
 					// Feeds, <permalink>/attachment/feed/(atom|...)
 					$sub2feed = $sub2 . $feedregex;
 
 					// And feeds again on to this <permalink>/attachment/(feed|atom...)
 					$sub2feed2 = $sub2 . $feedregex2;
 
 					// And <permalink>/comment-page-xx
 					$sub2comment = $sub2 . $commentregex;
 
 					// And <permalink>/embed/...
 					$sub2embed = $sub2 . $embedregex;
 
 					// Create queries for these extra tag-ons we've just dealt with.
 					$subquery        = $index . '?attachment=' . $this->preg_index( 1 );
 					$subtbquery      = $subquery . '&tb=1';
 					$subfeedquery    = $subquery . '&feed=' . $this->preg_index( 2 );
 					$subcommentquery = $subquery . '&cpage=' . $this->preg_index( 2 );
 					$subembedquery   = $subquery . '&embed=true';
 
 					// Do endpoints for attachments.
 					if ( ! empty( $endpoints ) ) {
 						foreach ( (array) $ep_query_append as $regex => $ep ) {
 							if ( $ep[0] & EP_ATTACHMENT ) {
 								$rewrite[ $sub1 . $regex ] = $subquery . $ep[1] . $this->preg_index( 3 );
 								$rewrite[ $sub2 . $regex ] = $subquery . $ep[1] . $this->preg_index( 3 );
 							}
 						}
 					}
 
 					/*
 					 * Now we've finished with endpoints, finish off the $sub1 and $sub2 matches
 					 * add a ? as we don't have to match that last slash, and finally a $ so we
 					 * match to the end of the URL
 					 */
 					$sub1 .= '?$';
 					$sub2 .= '?$';
 
 					/*
 					 * Post pagination, e.g. <permalink>/2/
 					 * Previously: '(/[0-9]+)?/?$', which produced '/2' for page.
 					 * When cast to int, returned 0.
 					 */
 					$match = $match . '(?:/([0-9]+))?/?$';
 					$query = $index . '?' . $query . '&page=' . $this->preg_index( $num_toks + 1 );
 
 					// Not matching a permalink so this is a lot simpler.
 				} else {
 					// Close the match and finalise the query.
 					$match .= '?$';
 					$query  = $index . '?' . $query;
 				}
 
 				/*
 				 * Create the final array for this dir by joining the $rewrite array (which currently
 				 * only contains rules/queries for trackback, pages etc) to the main regex/query for
 				 * this dir
 				 */
 				$rewrite = array_merge( $rewrite, array( $match => $query ) );
 
 				// If we're matching a permalink, add those extras (attachments etc) on.
 				if ( $post ) {
 					// Add trackback.
 					$rewrite = array_merge( array( $trackbackmatch => $trackbackquery ), $rewrite );
 
 					// Add embed.
 					$rewrite = array_merge( array( $embedmatch => $embedquery ), $rewrite );
 
 					// Add regexes/queries for attachments, attachment trackbacks and so on.
 					if ( ! $page ) {
 						// Require <permalink>/attachment/stuff form for pages because of confusion with subpages.
 						$rewrite = array_merge(
 							$rewrite,
 							array(
 								$sub1        => $subquery,
 								$sub1tb      => $subtbquery,
 								$sub1feed    => $subfeedquery,
 								$sub1feed2   => $subfeedquery,
 								$sub1comment => $subcommentquery,
 								$sub1embed   => $subembedquery,
 							)
 						);
 					}
 
 					$rewrite = array_merge(
 						array(
 							$sub2        => $subquery,
 							$sub2tb      => $subtbquery,
 							$sub2feed    => $subfeedquery,
 							$sub2feed2   => $subfeedquery,
 							$sub2comment => $subcommentquery,
 							$sub2embed   => $subembedquery,
 						),
 						$rewrite
 					);
 				}
 			}
 			// Add the rules for this dir to the accumulating $post_rewrite.
 			$post_rewrite = array_merge( $rewrite, $post_rewrite );
 		}
 
 		// The finished rules. phew!
 		return $post_rewrite;
 	}
 
 	/**
 	 * Generates rewrite rules with permalink structure and walking directory only.
 	 *
 	 * Shorten version of WP_Rewrite::generate_rewrite_rules() that allows for shorter
 	 * list of parameters. See the method for longer description of what generating
 	 * rewrite rules does.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @see WP_Rewrite::generate_rewrite_rules() See for long description and rest of parameters.
 	 *
 	 * @param string $permalink_structure The permalink structure to generate rules.
 	 * @param bool   $walk_dirs           Optional. Whether to create list of directories to walk over.
 	 *                                    Default false.
 	 * @return array
 	 */
 	public function generate_rewrite_rule( $permalink_structure, $walk_dirs = false ) {
 		return $this->generate_rewrite_rules( $permalink_structure, EP_NONE, false, false, false, $walk_dirs );
 	}
 
 	/**
 	 * Constructs rewrite matches and queries from permalink structure.
 	 *
 	 * Runs the action {@see 'generate_rewrite_rules'} with the parameter that is an
 	 * reference to the current WP_Rewrite instance to further manipulate the
 	 * permalink structures and rewrite rules. Runs the {@see 'rewrite_rules_array'}
 	 * filter on the full rewrite rule array.
 	 *
 	 * There are two ways to manipulate the rewrite rules, one by hooking into
 	 * the {@see 'generate_rewrite_rules'} action and gaining full control of the
 	 * object or just manipulating the rewrite rule array before it is passed
 	 * from the function.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string[] An associative array of matches and queries.
 	 */
 	public function rewrite_rules() {
 		$rewrite = array();
 
 		if ( empty( $this->permalink_structure ) ) {
 			return $rewrite;
 		}
 
 		// robots.txt -- only if installed at the root.
 		$home_path      = parse_url( home_url() );
 		$robots_rewrite = ( empty( $home_path['path'] ) || '/' === $home_path['path'] ) ? array( 'robots\.txt$' => $this->index . '?robots=1' ) : array();
 
 		// favicon.ico -- only if installed at the root.
 		$favicon_rewrite = ( empty( $home_path['path'] ) || '/' === $home_path['path'] ) ? array( 'favicon\.ico$' => $this->index . '?favicon=1' ) : array();
 
 		// Old feed and service files.
 		$deprecated_files = array(
 			'.*wp-(atom|rdf|rss|rss2|feed|commentsrss2)\.php$' => $this->index . '?feed=old',
 			'.*wp-app\.php(/.*)?$' => $this->index . '?error=403',
 		);
 
 		// Registration rules.
 		$registration_pages = array();
 		if ( is_multisite() && is_main_site() ) {
 			$registration_pages['.*wp-signup.php$']   = $this->index . '?signup=true';
 			$registration_pages['.*wp-activate.php$'] = $this->index . '?activate=true';
 		}
 
 		// Deprecated.
 		$registration_pages['.*wp-register.php$'] = $this->index . '?register=true';
 
 		// Post rewrite rules.
 		$post_rewrite = $this->generate_rewrite_rules( $this->permalink_structure, EP_PERMALINK );
 
 		/**
 		 * Filters rewrite rules used for "post" archives.
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param string[] $post_rewrite Array of rewrite rules for posts, keyed by their regex pattern.
 		 */
 		$post_rewrite = apply_filters( 'post_rewrite_rules', $post_rewrite );
 
 		// Date rewrite rules.
 		$date_rewrite = $this->generate_rewrite_rules( $this->get_date_permastruct(), EP_DATE );
 
 		/**
 		 * Filters rewrite rules used for date archives.
 		 *
 		 * Likely date archives would include /yyyy/, /yyyy/mm/, and /yyyy/mm/dd/.
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param string[] $date_rewrite Array of rewrite rules for date archives, keyed by their regex pattern.
 		 */
 		$date_rewrite = apply_filters( 'date_rewrite_rules', $date_rewrite );
 
 		// Root-level rewrite rules.
 		$root_rewrite = $this->generate_rewrite_rules( $this->root . '/', EP_ROOT );
 
 		/**
 		 * Filters rewrite rules used for root-level archives.
 		 *
 		 * Likely root-level archives would include pagination rules for the homepage
 		 * as well as site-wide post feeds (e.g. /feed/, and /feed/atom/).
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param string[] $root_rewrite Array of root-level rewrite rules, keyed by their regex pattern.
 		 */
 		$root_rewrite = apply_filters( 'root_rewrite_rules', $root_rewrite );
 
 		// Comments rewrite rules.
 		$comments_rewrite = $this->generate_rewrite_rules( $this->root . $this->comments_base, EP_COMMENTS, false, true, true, false );
 
 		/**
 		 * Filters rewrite rules used for comment feed archives.
 		 *
 		 * Likely comments feed archives include /comments/feed/, and /comments/feed/atom/.
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param string[] $comments_rewrite Array of rewrite rules for the site-wide comments feeds, keyed by their regex pattern.
 		 */
 		$comments_rewrite = apply_filters( 'comments_rewrite_rules', $comments_rewrite );
 
 		// Search rewrite rules.
 		$search_structure = $this->get_search_permastruct();
 		$search_rewrite   = $this->generate_rewrite_rules( $search_structure, EP_SEARCH );
 
 		/**
 		 * Filters rewrite rules used for search archives.
 		 *
 		 * Likely search-related archives include /search/search+query/ as well as
 		 * pagination and feed paths for a search.
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param string[] $search_rewrite Array of rewrite rules for search queries, keyed by their regex pattern.
 		 */
 		$search_rewrite = apply_filters( 'search_rewrite_rules', $search_rewrite );
 
 		// Author rewrite rules.
 		$author_rewrite = $this->generate_rewrite_rules( $this->get_author_permastruct(), EP_AUTHORS );
 
 		/**
 		 * Filters rewrite rules used for author archives.
 		 *
 		 * Likely author archives would include /author/author-name/, as well as
 		 * pagination and feed paths for author archives.
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param string[] $author_rewrite Array of rewrite rules for author archives, keyed by their regex pattern.
 		 */
 		$author_rewrite = apply_filters( 'author_rewrite_rules', $author_rewrite );
 
 		// Pages rewrite rules.
 		$page_rewrite = $this->page_rewrite_rules();
 
 		/**
 		 * Filters rewrite rules used for "page" post type archives.
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param string[] $page_rewrite Array of rewrite rules for the "page" post type, keyed by their regex pattern.
 		 */
 		$page_rewrite = apply_filters( 'page_rewrite_rules', $page_rewrite );
 
 		// Extra permastructs.
 		foreach ( $this->extra_permastructs as $permastructname => $struct ) {
 			if ( is_array( $struct ) ) {
 				if ( count( $struct ) == 2 ) {
 					$rules = $this->generate_rewrite_rules( $struct[0], $struct[1] );
 				} else {
 					$rules = $this->generate_rewrite_rules( $struct['struct'], $struct['ep_mask'], $struct['paged'], $struct['feed'], $struct['forcomments'], $struct['walk_dirs'], $struct['endpoints'] );
 				}
 			} else {
 				$rules = $this->generate_rewrite_rules( $struct );
 			}
 
 			/**
 			 * Filters rewrite rules used for individual permastructs.
 			 *
 			 * The dynamic portion of the hook name, `$permastructname`, refers
 			 * to the name of the registered permastruct, e.g. 'post_tag' (tags),
 			 * 'category' (categories), etc.
 			 *
 			 * @since 3.1.0
 			 *
 			 * @param string[] $rules Array of rewrite rules generated for the current permastruct, keyed by their regex pattern.
 			 */
 			$rules = apply_filters( "{$permastructname}_rewrite_rules", $rules );
 
 			if ( 'post_tag' === $permastructname ) {
 
 				/**
 				 * Filters rewrite rules used specifically for Tags.
 				 *
 				 * @since 2.3.0
 				 * @deprecated 3.1.0 Use {@see 'post_tag_rewrite_rules'} instead.
 				 *
 				 * @param string[] $rules Array of rewrite rules generated for tags, keyed by their regex pattern.
 				 */
 				$rules = apply_filters_deprecated( 'tag_rewrite_rules', array( $rules ), '3.1.0', 'post_tag_rewrite_rules' );
 			}
 
 			$this->extra_rules_top = array_merge( $this->extra_rules_top, $rules );
 		}
 
 		// Put them together.
 		if ( $this->use_verbose_page_rules ) {
 			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $page_rewrite, $post_rewrite, $this->extra_rules );
 		} else {
 			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $post_rewrite, $page_rewrite, $this->extra_rules );
 		}
 
 		/**
 		 * Fires after the rewrite rules are generated.
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param WP_Rewrite $this Current WP_Rewrite instance (passed by reference).
 		 */
 		do_action_ref_array( 'generate_rewrite_rules', array( &$this ) );
 
 		/**
 		 * Filters the full set of generated rewrite rules.
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param string[] $rules The compiled array of rewrite rules, keyed by their regex pattern.
 		 */
 		$this->rules = apply_filters( 'rewrite_rules_array', $this->rules );
 
 		return $this->rules;
 	}
 
 	/**
 	 * Retrieves the rewrite rules.
 	 *
 	 * The difference between this method and WP_Rewrite::rewrite_rules() is that
 	 * this method stores the rewrite rules in the 'rewrite_rules' option and retrieves
 	 * it. This prevents having to process all of the permalinks to get the rewrite rules
 	 * in the form of caching.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string[] Array of rewrite rules keyed by their regex pattern.
 	 */
 	public function wp_rewrite_rules() {
 		$this->rules = get_option( 'rewrite_rules' );
 		if ( empty( $this->rules ) ) {
 			$this->matches = 'matches';
 			$this->rewrite_rules();
 			if ( ! did_action( 'wp_loaded' ) ) {
 				add_action( 'wp_loaded', array( $this, 'flush_rules' ) );
 				return $this->rules;
 			}
 			update_option( 'rewrite_rules', $this->rules );
 		}
 
 		return $this->rules;
 	}
 
 	/**
 	 * Retrieves mod_rewrite-formatted rewrite rules to write to .htaccess.
 	 *
 	 * Does not actually write to the .htaccess file, but creates the rules for
 	 * the process that will.
 	 *
 	 * Will add the non_wp_rules property rules to the .htaccess file before
 	 * the WordPress rewrite rules one.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @return string
 	 */
 	public function mod_rewrite_rules() {
 		if ( ! $this->using_permalinks() ) {
 			return '';
 		}
 
 		$site_root = parse_url( site_url() );
 		if ( isset( $site_root['path'] ) ) {
 			$site_root = trailingslashit( $site_root['path'] );
 		}
 
 		$home_root = parse_url( home_url() );
 		if ( isset( $home_root['path'] ) ) {
 			$home_root = trailingslashit( $home_root['path'] );
 		} else {
 			$home_root = '/';
 		}
 
 		$rules  = "<IfModule mod_rewrite.c>\n";
 		$rules .= "RewriteEngine On\n";
 		$rules .= "RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]\n";
 		$rules .= "RewriteBase $home_root\n";
 
 		// Prevent -f checks on index.php.
 		$rules .= "RewriteRule ^index\.php$ - [L]\n";
 
 		// Add in the rules that don't redirect to WP's index.php (and thus shouldn't be handled by WP at all).
 		foreach ( (array) $this->non_wp_rules as $match => $query ) {
 			// Apache 1.3 does not support the reluctant (non-greedy) modifier.
 			$match = str_replace( '.+?', '.+', $match );
 
 			$rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
 		}
 
 		if ( $this->use_verbose_rules ) {
 			$this->matches = '';
 			$rewrite       = $this->rewrite_rules();
 			$num_rules     = count( $rewrite );
 			$rules        .= "RewriteCond %{REQUEST_FILENAME} -f [OR]\n" .
 				"RewriteCond %{REQUEST_FILENAME} -d\n" .
 				"RewriteRule ^.*$ - [S=$num_rules]\n";
 
 			foreach ( (array) $rewrite as $match => $query ) {
 				// Apache 1.3 does not support the reluctant (non-greedy) modifier.
 				$match = str_replace( '.+?', '.+', $match );
 
 				if ( strpos( $query, $this->index ) !== false ) {
 					$rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
 				} else {
 					$rules .= 'RewriteRule ^' . $match . ' ' . $site_root . $query . " [QSA,L]\n";
 				}
 			}
 		} else {
 			$rules .= "RewriteCond %{REQUEST_FILENAME} !-f\n" .
 				"RewriteCond %{REQUEST_FILENAME} !-d\n" .
 				"RewriteRule . {$home_root}{$this->index} [L]\n";
 		}
 
 		$rules .= "</IfModule>\n";
 
 		/**
 		 * Filters the list of rewrite rules formatted for output to an .htaccess file.
 		 *
 		 * @since 1.5.0
 		 *
 		 * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
 		 */
 		$rules = apply_filters( 'mod_rewrite_rules', $rules );
 
 		/**
 		 * Filters the list of rewrite rules formatted for output to an .htaccess file.
 		 *
 		 * @since 1.5.0
 		 * @deprecated 1.5.0 Use the {@see 'mod_rewrite_rules'} filter instead.
 		 *
 		 * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
 		 */
 		return apply_filters_deprecated( 'rewrite_rules', array( $rules ), '1.5.0', 'mod_rewrite_rules' );
 	}
 
 	/**
 	 * Retrieves IIS7 URL Rewrite formatted rewrite rules to write to web.config file.
 	 *
 	 * Does not actually write to the web.config file, but creates the rules for
 	 * the process that will.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @param bool $add_parent_tags Optional. Whether to add parent tags to the rewrite rule sets.
 	 *                              Default false.
 	 * @return string IIS7 URL rewrite rule sets.
 	 */
 	public function iis7_url_rewrite_rules( $add_parent_tags = false ) {
 		if ( ! $this->using_permalinks() ) {
 			return '';
 		}
 		$rules = '';
 		if ( $add_parent_tags ) {
 			$rules .= '<configuration>
 	<system.webServer>
 		<rewrite>
 			<rules>';
 		}
 
 		$rules .= '
 			<rule name="WordPress: ' . esc_attr( home_url() ) . '" patternSyntax="Wildcard">
 				<match url="*" />
 					<conditions>
 						<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
 						<add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
 					</conditions>
 				<action type="Rewrite" url="index.php" />
 			</rule>';
 
 		if ( $add_parent_tags ) {
 			$rules .= '
 			</rules>
 		</rewrite>
 	</system.webServer>
 </configuration>';
 		}
 
 		/**
 		 * Filters the list of rewrite rules formatted for output to a web.config.
 		 *
 		 * @since 2.8.0
 		 *
 		 * @param string $rules Rewrite rules formatted for IIS web.config.
 		 */
 		return apply_filters( 'iis7_url_rewrite_rules', $rules );
 	}
 
 	/**
 	 * Adds a rewrite rule that transforms a URL structure to a set of query vars.
 	 *
 	 * Any value in the $after parameter that isn't 'bottom' will result in the rule
 	 * being placed at the top of the rewrite rules.
 	 *
 	 * @since 2.1.0
 	 * @since 4.4.0 Array support was added to the `$query` parameter.
 	 *
 	 * @param string       $regex Regular expression to match request against.
 	 * @param string|array $query The corresponding query vars for this rewrite rule.
 	 * @param string       $after Optional. Priority of the new rule. Accepts 'top'
 	 *                            or 'bottom'. Default 'bottom'.
 	 */
 	public function add_rule( $regex, $query, $after = 'bottom' ) {
 		if ( is_array( $query ) ) {
 			$external = false;
 			$query    = add_query_arg( $query, 'index.php' );
 		} else {
 			$index = false === strpos( $query, '?' ) ? strlen( $query ) : strpos( $query, '?' );
 			$front = substr( $query, 0, $index );
 
 			$external = $front != $this->index;
 		}
 
 		// "external" = it doesn't correspond to index.php.
 		if ( $external ) {
 			$this->add_external_rule( $regex, $query );
 		} else {
 			if ( 'bottom' === $after ) {
 				$this->extra_rules = array_merge( $this->extra_rules, array( $regex => $query ) );
 			} else {
 				$this->extra_rules_top = array_merge( $this->extra_rules_top, array( $regex => $query ) );
 			}
 		}
 	}
 
 	/**
 	 * Adds a rewrite rule that doesn't correspond to index.php.
 	 *
 	 * @since 2.1.0
 	 *
 	 * @param string $regex Regular expression to match request against.
 	 * @param string $query The corresponding query vars for this rewrite rule.
 	 */
 	public function add_external_rule( $regex, $query ) {
 		$this->non_wp_rules[ $regex ] = $query;
 	}
 
 	/**
 	 * Adds an endpoint, like /trackback/.
 	 *
 	 * @since 2.1.0
 	 * @since 3.9.0 $query_var parameter added.
 	 * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
 	 *
 	 * @see add_rewrite_endpoint() for full documentation.
 	 * @global WP $wp Current WordPress environment instance.
 	 *
 	 * @param string      $name      Name of the endpoint.
 	 * @param int         $places    Endpoint mask describing the places the endpoint should be added.
 	 *                               Accepts a mask of:
 	 *                               - `EP_ALL`
 	 *                               - `EP_NONE`
 	 *                               - `EP_ALL_ARCHIVES`
 	 *                               - `EP_ATTACHMENT`
 	 *                               - `EP_AUTHORS`
 	 *                               - `EP_CATEGORIES`
 	 *                               - `EP_COMMENTS`
 	 *                               - `EP_DATE`
 	 *                               - `EP_DAY`
 	 *                               - `EP_MONTH`
 	 *                               - `EP_PAGES`
 	 *                               - `EP_PERMALINK`
 	 *                               - `EP_ROOT`
 	 *                               - `EP_SEARCH`
 	 *                               - `EP_TAGS`
 	 *                               - `EP_YEAR`
 	 * @param string|bool $query_var Optional. Name of the corresponding query variable. Pass `false` to
 	 *                               skip registering a query_var for this endpoint. Defaults to the
 	 *                               value of `$name`.
 	 */
 	public function add_endpoint( $name, $places, $query_var = true ) {
 		global $wp;
 
 		// For backward compatibility, if null has explicitly been passed as `$query_var`, assume `true`.
 		if ( true === $query_var || null === $query_var ) {
 			$query_var = $name;
 		}
 		$this->endpoints[] = array( $places, $name, $query_var );
 
 		if ( $query_var ) {
 			$wp->add_query_var( $query_var );
 		}
 	}
 
 	/**
 	 * Adds a new permalink structure.
 	 *
 	 * A permalink structure (permastruct) is an abstract definition of a set of rewrite rules;
 	 * it is an easy way of expressing a set of regular expressions that rewrite to a set of
 	 * query strings. The new permastruct is added to the WP_Rewrite::$extra_permastructs array.
 	 *
 	 * When the rewrite rules are built by WP_Rewrite::rewrite_rules(), all of these extra
 	 * permastructs are passed to WP_Rewrite::generate_rewrite_rules() which transforms them
 	 * into the regular expressions that many love to hate.
 	 *
 	 * The `$args` parameter gives you control over how WP_Rewrite::generate_rewrite_rules()
 	 * works on the new permastruct.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @param string $name   Name for permalink structure.
 	 * @param string $struct Permalink structure (e.g. category/%category%)
 	 * @param array  $args   {
 	 *     Optional. Arguments for building rewrite rules based on the permalink structure.
 	 *     Default empty array.
 	 *
 	 *     @type bool $with_front  Whether the structure should be prepended with `WP_Rewrite::$front`.
 	 *                             Default true.
 	 *     @type int  $ep_mask     The endpoint mask defining which endpoints are added to the structure.
 	 *                             Accepts a mask of:
 	 *                             - `EP_ALL`
 	 *                             - `EP_NONE`
 	 *                             - `EP_ALL_ARCHIVES`
 	 *                             - `EP_ATTACHMENT`
 	 *                             - `EP_AUTHORS`
 	 *                             - `EP_CATEGORIES`
 	 *                             - `EP_COMMENTS`
 	 *                             - `EP_DATE`
 	 *                             - `EP_DAY`
 	 *                             - `EP_MONTH`
 	 *                             - `EP_PAGES`
 	 *                             - `EP_PERMALINK`
 	 *                             - `EP_ROOT`
 	 *                             - `EP_SEARCH`
 	 *                             - `EP_TAGS`
 	 *                             - `EP_YEAR`
 	 *                             Default `EP_NONE`.
 	 *     @type bool $paged       Whether archive pagination rules should be added for the structure.
 	 *                             Default true.
 	 *     @type bool $feed        Whether feed rewrite rules should be added for the structure. Default true.
 	 *     @type bool $forcomments Whether the feed rules should be a query for a comments feed. Default false.
 	 *     @type bool $walk_dirs   Whether the 'directories' making up the structure should be walked over
 	 *                             and rewrite rules built for each in-turn. Default true.
 	 *     @type bool $endpoints   Whether endpoints should be applied to the generated rules. Default true.
 	 * }
 	 */
 	public function add_permastruct( $name, $struct, $args = array() ) {
 		// Back-compat for the old parameters: $with_front and $ep_mask.
 		if ( ! is_array( $args ) ) {
 			$args = array( 'with_front' => $args );
 		}
 		if ( func_num_args() == 4 ) {
 			$args['ep_mask'] = func_get_arg( 3 );
 		}
 
 		$defaults = array(
 			'with_front'  => true,
 			'ep_mask'     => EP_NONE,
 			'paged'       => true,
 			'feed'        => true,
 			'forcomments' => false,
 			'walk_dirs'   => true,
 			'endpoints'   => true,
 		);
 		$args     = array_intersect_key( $args, $defaults );
 		$args     = wp_parse_args( $args, $defaults );
 
 		if ( $args['with_front'] ) {
 			$struct = $this->front . $struct;
 		} else {
 			$struct = $this->root . $struct;
 		}
 		$args['struct'] = $struct;
 
 		$this->extra_permastructs[ $name ] = $args;
 	}
 
 	/**
 	 * Removes a permalink structure.
 	 *
 	 * @since 4.5.0
 	 *
 	 * @param string $name Name for permalink structure.
 	 */
 	public function remove_permastruct( $name ) {
 		unset( $this->extra_permastructs[ $name ] );
 	}
 
 	/**
 	 * Removes rewrite rules and then recreate rewrite rules.
 	 *
 	 * Calls WP_Rewrite::wp_rewrite_rules() after removing the 'rewrite_rules' option.
 	 * If the function named 'save_mod_rewrite_rules' exists, it will be called.
 	 *
 	 * @since 2.0.1
 	 *
 	 * @param bool $hard Whether to update .htaccess (hard flush) or just update rewrite_rules option (soft flush). Default is true (hard).
 	 */
 	public function flush_rules( $hard = true ) {
 		static $do_hard_later = null;
 
 		// Prevent this action from running before everyone has registered their rewrites.
 		if ( ! did_action( 'wp_loaded' ) ) {
 			add_action( 'wp_loaded', array( $this, 'flush_rules' ) );
 			$do_hard_later = ( isset( $do_hard_later ) ) ? $do_hard_later || $hard : $hard;
 			return;
 		}
 
 		if ( isset( $do_hard_later ) ) {
 			$hard = $do_hard_later;
 			unset( $do_hard_later );
 		}
 
 		update_option( 'rewrite_rules', '' );
 		$this->wp_rewrite_rules();
 
 		/**
 		 * Filters whether a "hard" rewrite rule flush should be performed when requested.
 		 *
 		 * A "hard" flush updates .htaccess (Apache) or web.config (IIS).
 		 *
 		 * @since 3.7.0
 		 *
 		 * @param bool $hard Whether to flush rewrite rules "hard". Default true.
 		 */
 		if ( ! $hard || ! apply_filters( 'flush_rewrite_rules_hard', true ) ) {
 			return;
 		}
 		if ( function_exists( 'save_mod_rewrite_rules' ) ) {
 			save_mod_rewrite_rules();
 		}
 		if ( function_exists( 'iis7_save_url_rewrite_rules' ) ) {
 			iis7_save_url_rewrite_rules();
 		}
 	}
 
 	/**
 	 * Sets up the object's properties.
 	 *
 	 * The 'use_verbose_page_rules' object property will be set to true if the
 	 * permalink structure begins with one of the following: '%postname%', '%category%',
 	 * '%tag%', or '%author%'.
 	 *
 	 * @since 1.5.0
 	 */
 	public function init() {
 		$this->extra_rules         = array();
 		$this->non_wp_rules        = array();
 		$this->endpoints           = array();
 		$this->permalink_structure = get_option( 'permalink_structure' );
 		$this->front               = substr( $this->permalink_structure, 0, strpos( $this->permalink_structure, '%' ) );
 		$this->root                = '';
 
 		if ( $this->using_index_permalinks() ) {
 			$this->root = $this->index . '/';
 		}
 
 		unset( $this->author_structure );
 		unset( $this->date_structure );
 		unset( $this->page_structure );
 		unset( $this->search_structure );
 		unset( $this->feed_structure );
 		unset( $this->comment_feed_structure );
 
 		$this->use_trailing_slashes = ( '/' === substr( $this->permalink_structure, -1, 1 ) );
 
 		// Enable generic rules for pages if permalink structure doesn't begin with a wildcard.
 		if ( preg_match( '/^[^%]*%(?:postname|category|tag|author)%/', $this->permalink_structure ) ) {
 			$this->use_verbose_page_rules = true;
 		} else {
 			$this->use_verbose_page_rules = false;
 		}
 	}
 
 	/**
 	 * Sets the main permalink structure for the site.
 	 *
 	 * Will update the 'permalink_structure' option, if there is a difference
 	 * between the current permalink structure and the parameter value. Calls
 	 * WP_Rewrite::init() after the option is updated.
 	 *
 	 * Fires the {@see 'permalink_structure_changed'} action once the init call has
 	 * processed passing the old and new values
 	 *
 	 * @since 1.5.0
 	 *
 	 * @param string $permalink_structure Permalink structure.
 	 */
 	public function set_permalink_structure( $permalink_structure ) {
 		if ( $permalink_structure != $this->permalink_structure ) {
 			$old_permalink_structure = $this->permalink_structure;
 			update_option( 'permalink_structure', $permalink_structure );
 
 			$this->init();
 
 			/**
 			 * Fires after the permalink structure is updated.
 			 *
 			 * @since 2.8.0
 			 *
 			 * @param string $old_permalink_structure The previous permalink structure.
 			 * @param string $permalink_structure     The new permalink structure.
 			 */
 			do_action( 'permalink_structure_changed', $old_permalink_structure, $permalink_structure );
 		}
 	}
 
 	/**
 	 * Sets the category base for the category permalink.
 	 *
 	 * Will update the 'category_base' option, if there is a difference between
 	 * the current category base and the parameter value. Calls WP_Rewrite::init()
 	 * after the option is updated.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @param string $category_base Category permalink structure base.
 	 */
 	public function set_category_base( $category_base ) {
 		if ( get_option( 'category_base' ) !== $category_base ) {
 			update_option( 'category_base', $category_base );
 			$this->init();
 		}
 	}
 
 	/**
 	 * Sets the tag base for the tag permalink.
 	 *
 	 * Will update the 'tag_base' option, if there is a difference between the
 	 * current tag base and the parameter value. Calls WP_Rewrite::init() after
 	 * the option is updated.
 	 *
 	 * @since 2.3.0
 	 *
 	 * @param string $tag_base Tag permalink structure base.
 	 */
 	public function set_tag_base( $tag_base ) {
 		if ( get_option( 'tag_base' ) !== $tag_base ) {
 			update_option( 'tag_base', $tag_base );
 			$this->init();
 		}
 	}
 
 	/**
 	 * Constructor - Calls init(), which runs setup.
 	 *
 	 * @since 1.5.0
 	 */
 	public function __construct() {
 		$this->init();
 	}
 }