File Content: categories-20260703023209.php <?php /** * Server-side rendering of the `core/categories` block. * * @package WordPress */ /** * Renders the `core/categories` block on server. * * @param array $attributes The block attributes. * * @return string Returns the categories list/dropdown markup. */ function render_block_core_categories( $attributes ) { static $block_id = 0; $block_id++; $args = array( 'echo' => false, 'hierarchical' => ! empty( $attributes['showHierarchy'] ), 'orderby' => 'name', 'show_count' => ! empty( $attributes['showPostCounts'] ), 'title_li' => '', ); if ( ! empty( $attributes['displayAsDropdown'] ) ) { $id = 'wp-block-categories-' . $block_id; $args['id'] = $id; $args['show_option_none'] = __( 'Select Category' ); $wrapper_markup = '<div %1$s>%2$s</div>'; $items_markup = wp_dropdown_categories( $args ); $type = 'dropdown'; if ( ! is_admin() ) { // Inject the dropdown script immediately after the select dropdown. $items_markup = preg_replace( '#(?<=</select>)#', build_dropdown_script_block_core_categories( $id ), $items_markup, 1 ); } } else { $wrapper_markup = '<ul %1$s>%2$s</ul>'; $items_markup = wp_list_categories( $args ); $type = 'list'; } $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => "wp-block-categories-{$type}" ) ); return sprintf( $wrapper_markup, $wrapper_attributes, $items_markup ); } /** * Generates the inline script for a categories dropdown field. * * @param string $dropdown_id ID of the dropdown field. * * @return string Returns the dropdown onChange redirection script. */ function build_dropdown_script_block_core_categories( $dropdown_id ) { ob_start(); ?> <script type='text/javascript'> /* <![CDATA[ */ ( function() { var dropdown = document.getElementById( '<?php echo esc_js( $dropdown_id ); ?>' ); function onCatChange() { if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) { location.href = "<?php echo home_url(); ?>/?cat=" + dropdown.options[ dropdown.selectedIndex ].value; } } dropdown.onchange = onCatChange; })(); /* ]]> */ </script> <?php return ob_get_clean(); } /** * Registers the `core/categories` block on server. */ function register_block_core_categories() { register_block_type_from_metadata( __DIR__ . '/categories', array( 'render_callback' => 'render_block_core_categories', ) ); } add_action( 'init', 'register_block_core_categories' ); Submit