Remove unused images

remove-img.php

<?php
/*  create this code in a file in the main wordpress directory e.g. delmedia.php
    and access it via mydomain.com/delmedia.php

   obviously this can do serious damage

   set to delete 100 a time to avoid time outs and menatto be run perioidically by cron

   otherise run directly by php command line and don't worry about limits  
*/
// Include the wp-load'er
include('wp-load.php');


//  build an array of images here by scanning options and post meta for any image files names
$safe = array();

$args= array(
  'post_type'      => 'attachment', // obvious
  'posts_per_page' => -1            // get them all 
);
 
// get all attachments post ids
echo "start<br>";
$posts = get_posts( $args );
echo "got<br>";
$i=0;
echo count($posts)."<br>";
foreach ($posts as $post_id) {
   // get an array of image data
   $image_attributes = wp_get_attachment_image_src( $post_id->ID );
        if ($post_id->post_parent==0) {
                if (!empty($image_attributes[0])) {
                        $i++;
                        if ($i>100) {
                                break;
                        }
                        if (// some sort or array search of $safe and $image_attributes[0] to check if not to be kept //) {
                          echo '<br>Image Found : '.$i." - ".$image_attributes[0];
                                if (false ===  wp_delete_attachment( $post_id->ID, true ) )  {
                                  echo ' and delete failed!<br>';
                                 } else {
                                  echo ' and delete succeeded!<br>';
                        } 
                        }
                }
        }