代码实现为 WordPress 后台文章添加自定义批量操作

    // 在批量操作下拉列表中添加选项

    add_filter( 'bulk_actions-edit-post', 'zm_my_bulk_actions' );

    function zm_my_bulk_actions( $bulk_array ) {

    	$bulk_array['zm_make_draft'] = '状态改为草稿';

    	$bulk_array['zm_set_price'] = '添加自定义字段 ';

    	return $bulk_array;

    }

    // 处理执行

    add_filter( 'handle_bulk_actions-edit-post', 'zm_bulk_action_handler', 10, 3 );

    function zm_bulk_action_handler( $redirect, $doaction, $object_ids ) {

    	$redirect = remove_query_arg( array( 'zm_make_draft_done', 'zm_bulk_price_changed' ), $redirect );

    	// 改为草稿

    	if ( $doaction == 'zm_make_draft' ) {

    		foreach ( $object_ids as $post_id ) {

    			wp_update_post( array(

    				'ID' => $post_id,

    				'post_status' => 'draft'// 草稿

    			) );

    		}

    		$redirect = add_query_arg( 'zm_make_draft_done', count( $object_ids ), $redirect );

    	}

    	// 添加自定义字段

    	if ( $doaction == 'zm_set_price' ) {

    		foreach ( $object_ids as $post_id ) {

    			update_post_meta( $post_id, 'product_price', 1000 );// 自定义字段名称：product_price，值：1000

    		}

    		$redirect = add_query_arg( 'zm_bulk_price_changed', count( $object_ids ), $redirect );

    	}

    	return $redirect;

    }

    // 添加提示文字

    add_action( 'admin_notices', 'zm_bulk_action_notices' );

    function zm_bulk_action_notices() {

    	// 改为草稿

    	if ( ! empty( $_REQUEST['zm_make_draft_done'] ) ) {

    		echo '<div id="message" class="updated notice is-dismissible">

    			<p>文章状态已更新。</p>

    		</div>';

    	}

    	// 添加自定义字段

    	if( ! empty( $_REQUEST['zm_bulk_price_changed'] ) ) {

    		printf( '<div id="message" class="updated notice is-dismissible"><p>' .

    			_n( '有 %s 文章添加了价格自定义字段。',

    			'有 %s 文章添加了价格自定义字段。',

    			intval( $_REQUEST['zm_bulk_price_changed'] )

    		) . '</p></div>', intval( $_REQUEST['zm_bulk_price_changed'] ) );

    	}

    }