Function to Delete All Attachments for a Post

wp-delete-post-attachments.php

// Delete All Attachments for a Specified Post
// -------------------------------------------
function wp_delete_post_attachments($post, $deletethumbnail = false);

  if (!is_object( $post )) {$post = get_post( $post );}

  $uploads = wp_upload_dir();

  $args = array(
    'post_type'   => 'attachment',
    'numberposts' => -1,
    'post_status' => 'any',
    'post_parent' => $post->ID,
  );
  
  if ( $deletethumbnail ) {
    $args['exclude'] => get_post_thumbnail_id( $post->ID );
  }
  
  $attachments = get_posts( $args );

  if ( $attachments ) {
    foreach ( $attachments as $attachment ) {

      $data = wp_get_attachment_metadata( $attachment->ID );
      unlink( $uploads['basedir'] . '/' . $data['file'] );

      foreach ( $data['sizes'] as $size ) {
          unlink( $uploads['basedir'] . '/' . $size['file'] );
      }

      wp_delete_post( $attachment->ID );
    }
  }

}