WordPress删除文章时同步删除对应的缩略图及图片附件

没错，草根站长的福音，删除文章时自动删除其特色图片及图片附件内容，有效的节省空间资源，只压根几行代码就可以实现完全的文章内容净化，不需要再去媒体库里翻看对应的图片附件，精准且高效。

/* 删除文章时删除图片附件 add:20250311-1422
/* ------------------------ */
function delete_post_and_attachments($post_ID) {
global $wpdb;
//删除特色图片
$thumbnails = $wpdb->get_results( "SELECT * FROM $wpdb->postmeta WHERE meta_key = '_thumbnail_id' AND post_id = $post_ID" );
foreach ( $thumbnails as $thumbnail ) {
wp_delete_attachment( $thumbnail->meta_value, true );
}
//删除图片附件
$attachments = $wpdb->get_results( "SELECT * FROM $wpdb->posts WHERE post_parent = $post_ID AND post_type = 'attachment'" );
foreach ( $attachments as $attachment ) {
wp_delete_attachment( $attachment->ID, true );
}
$wpdb->query( "DELETE FROM $wpdb->postmeta WHERE meta_key = '_thumbnail_id' AND post_id = $post_ID" );
}
add_action('before_delete_post', 'delete_post_and_attachments');

把代码复制添加到主题的函数文件functions.php中，如果在使用action delete_post而不是before_delete_post将导致删除文章后因媒体附件与文章关联已取消而无法正确删除。

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