Clean uploads directory from unused images. Part 1: Define all images used by all custom post type's and combine them into list. Part 2: Dekete all images from wp-content/uploads that are not in list [WordPress]

delete_unused_images_part1_define_good.php

$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);

delete_unused_images_part2_delete_bad.php

//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);	 					
			}			
	} 
}