Программное удаление (на PHP) мультимедиа в WordPress: вложения, неприкрепленные изображения, 404, потерянные

function delete_unattached_attachments(){
    $attachments = get_posts( array(
    'post_type' => 'attachment',                        
    'numberposts' => -1,                                      
    'fields' => 'ids', 
    'post_parent' => 0,
        ));                                 
        if ($attachments) {             
            foreach ($attachments as $attachmentID){
                $attachment_path = get_attached_file( $attachmentID); 
                //Delete attachment from database only, not file
                $delete_attachment = wp_delete_attachment($attachmentID, true);
                //Delete attachment file from disk
                $delete_file = unlink($attachment_path);                    
            }                   
        }               
}

function delete_cpt_attachments(){
    $attachments = get_posts( array(
    'post_type' => 'attachment',                        
    'numberposts' =>-1,                                       
        ));                                 
        if ($attachments) {             
            foreach ($attachments as $attachment){
        $parent_id = $attachment->post_parent;                  
                if ('card' == get_post_type($parent_id)) {
                    $attachmentID = $attachment->ID;                            
                    $attachment_path = get_attached_file( $attachmentID);                   
                    //Delete attachment from database only, not file
                    $delete_attachment = wp_delete_attachment($attachmentID, true);
                    //Delete attachment file from disk
                    $delete_file = unlink($attachment_path);
                }               
            }
        }                   
}

function delete_404_attachments(){
    $attachments = get_posts( array(
    'post_type' => 'attachment',                        
    'numberposts' => -1,                                      
    'fields' => 'ids'
        ));                                 
        if ($attachments) {             
            foreach ($attachments as $attachmentID){
                $file_url = wp_get_attachment_url( $attachmentID);                                              
                $file_headers = @get_headers($file_url);
                if($file_headers[0] == 'HTTP/1.1 404 Not Found') {
                    $deleted = wp_delete_attachment($attachmentID, true);
                }               
            }
        }                   
}

//Delete orphaned files in wp-content/uploads that are not wordpress attachments
function clean_uploads_from_nonattachments(){
    $uploads_dir = wp_upload_dir(); 
    $search = $uploads_dir['basedir'];
    $replace = $uploads_dir['baseurl'];
    //You may want to take it by bites if your uploads is rather large (over 5 gb for example)
    //$uploads_dir = ($uploads_dir['basedir']. '/2015/' ); 
    $uploads_dir = ($uploads_dir['basedir']); 
    $root = $uploads_dir;
    //Going through directiry recursevely
    $iter = new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator($root, RecursiveDirectoryIterator::SKIP_DOTS),
        RecursiveIteratorIterator::SELF_FIRST,
        RecursiveIteratorIterator::CATCH_GET_CHILD // Ignore "Permission denied"
    );
    foreach ($iter as $fileinfo) {
        //get files only
        if ($fileinfo->isFile()) {  
            $image = $fileinfo->getPathname();
            $image_url = str_replace($search, $replace, $image);
            //Core WP function to retrieve attachment ID by URL
            $attachment_id = attachment_url_to_postid($image_url);
                //Not found - then delete file 
                if (!$attachment_id){
                    unlink($image); 
                }
                else {
                    //List of found attachments
                    echo $attachment_id.': '.$image;             
                }   
        }
    }           
}

$args = array( 'post_type' =>'post', 'posts_per_page' => -1, 'post_status' => 'any', 'fields' =>'ids');
$myposts = get_posts( $args );
$all_bookcovers_posts = array();
    foreach ($myposts as $mypostid) {  
        $bookcover = get_field('bookcover', $mypostid);
        $all_bookcovers_posts[] = $bookcover;  
    }
$args = array( 'post_type' =>'book_list', 'posts_per_page' => -1, 'post_status' => 'any', 'fields' =>'ids');
$myposts = get_posts( $args );
$all_bookcovers_book_lists = array();
    foreach ($myposts as $mypostid) {  
        $book_list_pictrue = get_field('book_list_pictrue', $mypostid);
        $all_bookcovers_book_lists[] = $book_list_pictrue;
    }   
$args = array( 'post_type' =>'bookauthor', 'posts_per_page' => -1, 'post_status' => 'any', 'fields' =>'ids');
$myposts = get_posts( $args );
$all_bookcovers_bookauthors = array();
    foreach ($myposts as $mypostid) {  
        $bookauthor_picture = get_field('bookauthor_picture', $mypostid);
        $all_bookcovers_bookauthors[] = $bookauthor_picture;
    }
$all_good_pictures = array_merge($all_bookcovers_book_lists, $all_bookcovers_bookauthors, $all_bookcovers_posts);
$all_good_pictures = array_filter($all_good_pictures);

//Look through wp-content/uploads directory
$uploads_dir = wp_upload_dir(); 
$search = $uploads_dir['basedir'];
$replace = $uploads_dir['baseurl'];       
$uploads_dir = ($uploads_dir['basedir']); 
$root = $uploads_dir;
//Going through directiry recursevely   
$iter = new RecursiveIteratorIterator(
    new RecursiveDirectoryIterator($root, RecursiveDirectoryIterator::SKIP_DOTS),
    RecursiveIteratorIterator::SELF_FIRST,
    RecursiveIteratorIterator::CATCH_GET_CHILD // Ignore "Permission denied"
);
foreach ($iter as $fileinfo) {
    if ($fileinfo->isFile()) {              
        $image = $fileinfo->getPathname();
        $image_url = str_replace($search, $replace, $image);
            //Delete if file is not found in list of good images
            if (!in_array($image_url, $all_good_pictures)) {                    
                unlink($image);                     
            }           
    } 
}