WordPress批量删除特色图像

将下面的代码添加到functions.php文件中.

global $wpdb;
$wpdb->query( "
DELETE FROM $wpdb->postmeta
WHERE meta_key = '_thumbnail_id'
" );

Via:https://www.wpbeginner.com/wp-tutorials/how-to-bulk-remove-featured-images-from-posts-in-wordpress/