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class-walker-category-dropdown.php (2133B)

      1 <?php
      2 /**
      3  * Taxonomy API: Walker_CategoryDropdown class
      4  *
      5  * @package WordPress
      6  * @subpackage Template
      7  * @since 4.4.0
      8  */
      9 
     10 /**
     11  * Core class used to create an HTML dropdown list of Categories.
     12  *
     13  * @since 2.1.0
     14  *
     15  * @see Walker
     16  */
     17 class Walker_CategoryDropdown extends Walker {
     18 
     19 	/**
     20 	 * What the class handles.
     21 	 *
     22 	 * @since 2.1.0
     23 	 * @var string
     24 	 *
     25 	 * @see Walker::$tree_type
     26 	 */
     27 	public $tree_type = 'category';
     28 
     29 	/**
     30 	 * Database fields to use.
     31 	 *
     32 	 * @since 2.1.0
     33 	 * @todo Decouple this
     34 	 * @var array
     35 	 *
     36 	 * @see Walker::$db_fields
     37 	 */
     38 	public $db_fields = array(
     39 		'parent' => 'parent',
     40 		'id'     => 'term_id',
     41 	);
     42 
     43 	/**
     44 	 * Starts the element output.
     45 	 *
     46 	 * @since 2.1.0
     47 	 *
     48 	 * @see Walker::start_el()
     49 	 *
     50 	 * @param string  $output   Used to append additional content (passed by reference).
     51 	 * @param WP_Term $category Category data object.
     52 	 * @param int     $depth    Depth of category. Used for padding.
     53 	 * @param array   $args     Uses 'selected', 'show_count', and 'value_field' keys, if they exist.
     54 	 *                          See wp_dropdown_categories().
     55 	 * @param int     $id       Optional. ID of the current category. Default 0 (unused).
     56 	 */
     57 	public function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) {
     58 		$pad = str_repeat( '&nbsp;', $depth * 3 );
     59 
     60 		/** This filter is documented in wp-includes/category-template.php */
     61 		$cat_name = apply_filters( 'list_cats', $category->name, $category );
     62 
     63 		if ( isset( $args['value_field'] ) && isset( $category->{$args['value_field']} ) ) {
     64 			$value_field = $args['value_field'];
     65 		} else {
     66 			$value_field = 'term_id';
     67 		}
     68 
     69 		$output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $category->{$value_field} ) . '"';
     70 
     71 		// Type-juggling causes false matches, so we force everything to a string.
     72 		if ( (string) $category->{$value_field} === (string) $args['selected'] ) {
     73 			$output .= ' selected="selected"';
     74 		}
     75 		$output .= '>';
     76 		$output .= $pad . $cat_name;
     77 		if ( $args['show_count'] ) {
     78 			$output .= '&nbsp;&nbsp;(' . number_format_i18n( $category->count ) . ')';
     79 		}
     80 		$output .= "</option>\n";
     81 	}
     82 }