WordPress 添加后台文章列表自定义分类筛选

add_action('restrict_manage_posts', function($post_type){

	if($taxonomies	= get_object_taxonomies($post_type, 'objects')){

		foreach($taxonomies as $taxonomy) {

			if(empty($taxonomy->hierarchical) || empty($taxonomy->show_admin_column)){

				continue;

			}

			if($taxonomy->name == 'category'){

				$taxonomy_key	= 'cat';

			}else{

				$taxonomy_key	= $taxonomy->name.'_id';

			}

			$selected	= 0;

			if(!empty($_REQUEST[$taxonomy_key])){

				$selected	= $_REQUEST[$taxonomy_key];

			}elseif(!empty($_REQUEST['taxonomy']) && ($_REQUEST['taxonomy'] == $taxonomy->name) && !empty($_REQUEST['term'])){

				if($term		= get_term_by('slug', $_REQUEST['term'], $taxonomy->name)){

					$selected	= $term->term_id;

				}

			}elseif(!empty($taxonomy->query_var) && !empty($_REQUEST[$taxonomy->query_var])){

				if($term	= get_term_by('slug', $_REQUEST[$taxonomy->query_var], $taxonomy->name)){

					$selected	= $term->term_id;

				}

			}

			wp_dropdown_categories(array(

				'taxonomy'			=> $taxonomy->name,

				'show_option_all'	=> $taxonomy->labels->all_items,

				'show_option_none'	=> '没有设置',

				'hide_if_empty'		=> true,

				'hide_empty'		=> 0,

				'hierarchical'		=> 1,

				'show_count'		=> 0,

				'orderby'			=> 'name',

				'name'				=> $taxonomy_key,

				'selected'			=> $selected

			));

		}

	}

});

add_action( 'restrict_manage_posts', 'erphp_task_filter_by_taxonomies' , 10, 2);

function erphp_task_filter_by_taxonomies( $post_type, $which ) {

if ( 'task' !== $post_type )

return;

$taxonomies = array( 'tasks' );//这里可以加多个自定义分类法

foreach ( $taxonomies as $taxonomy_slug ) {

$taxonomy_obj = get_taxonomy( $taxonomy_slug );

$taxonomy_name = $taxonomy_obj->labels->name;

$terms = get_terms( $taxonomy_slug );

echo "<select name='{$taxonomy_slug}' id='{$taxonomy_slug}' class='postform'>";

echo '<option value="">' . sprintf( esc_html__( '%s', 'text_domain' ), $taxonomy_name ) . '</option>';

foreach ( $terms as $term ) {

printf(

'<option value="%1$s" %2$s>%3$s (%4$s)</option>',

$term->slug,

( ( isset( $_GET[$taxonomy_slug] ) && ( $_GET[$taxonomy_slug] == $term->slug ) ) ? ' selected="selected"' : '' ),

$term->name,

$term->count

);

}

echo '</select>';

}

}