<h3>Düzenle: class-walker-category-dropdown.php</h3>
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/**
 * Taxonomy API: Walker_CategoryDropdown class
 *
 * @package WordPress
 * @subpackage Template
 * @since 4.4.0
 */

/**
 * Core class used to create an HTML dropdown list of Categories.
 *
 * @since 2.1.0
 *
 * @see Walker
 */
class Walker_CategoryDropdown extends Walker {

	/**
	 * What the class handles.
	 *
	 * @since 2.1.0
	 * @var string
	 *
	 * @see Walker::$tree_type
	 */
	public $tree_type = &#039;category&#039;;

	/**
	 * Database fields to use.
	 *
	 * @since 2.1.0
	 * @todo Decouple this
	 * @var string[]
	 *
	 * @see Walker::$db_fields
	 */
	public $db_fields = array(
		&#039;parent&#039; =&gt; &#039;parent&#039;,
		&#039;id&#039;     =&gt; &#039;term_id&#039;,
	);

	/**
	 * Starts the element output.
	 *
	 * @since 2.1.0
	 * @since 5.9.0 Renamed `$category` to `$data_object` and `$id` to `$current_object_id`
	 *              to match parent class for PHP 8 named parameter support.
	 *
	 * @see Walker::start_el()
	 *
	 * @param string  $output            Used to append additional content (passed by reference).
	 * @param WP_Term $data_object       Category data object.
	 * @param int     $depth             Depth of category. Used for padding.
	 * @param array   $args              Uses &#039;selected&#039;, &#039;show_count&#039;, and &#039;value_field&#039; keys, if they exist.
	 *                                   See wp_dropdown_categories().
	 * @param int     $current_object_id Optional. ID of the current category. Default 0.
	 */
	public function start_el( &amp;$output, $data_object, $depth = 0, $args = array(), $current_object_id = 0 ) {
		// Restores the more descriptive, specific name for use within this method.
		$category = $data_object;

		$pad = str_repeat( &#039;&amp;nbsp;&#039;, $depth * 3 );

		/** This filter is documented in wp-includes/category-template.php */
		$cat_name = apply_filters( &#039;list_cats&#039;, $category-&gt;name, $category );

		if ( isset( $args[&#039;value_field&#039;] ) &amp;&amp; isset( $category-&gt;{$args[&#039;value_field&#039;]} ) ) {
			$value_field = $args[&#039;value_field&#039;];
		} else {
			$value_field = &#039;term_id&#039;;
		}

		$output .= &quot;\t&lt;option class=\&quot;level-$depth\&quot; value=\&quot;&quot; . esc_attr( $category-&gt;{$value_field} ) . &#039;&quot;&#039;;

		// Type-juggling causes false matches, so we force everything to a string.
		if ( (string) $category-&gt;{$value_field} === (string) $args[&#039;selected&#039;] ) {
			$output .= &#039; selected=&quot;selected&quot;&#039;;
		}
		$output .= &#039;&gt;&#039;;
		$output .= $pad . $cat_name;
		if ( $args[&#039;show_count&#039;] ) {
			$output .= &#039;&amp;nbsp;&amp;nbsp;(&#039; . number_format_i18n( $category-&gt;count ) . &#039;)&#039;;
		}
		$output .= &quot;&lt;/option&gt;\n&quot;;
	}
}
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