PHP warnings when processing 404 images in post content

We encountered PHP warnings when the plugin processes missing/404 images embedded in post content:

PHP Warning: file_get_contents(https://example.com/images/missing.jpg):
Failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found

PHP Warning: exif_imagetype(https://example.com/wp-content/uploads/missing.gif):
Failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found

Issue: The saswp_get_image_details() function attempts to validate all images in content, including external or broken URLs, causing error log spam.

Workaround: We added a filter to only process images from our uploads directory:

add_filter('saswp_get_image_details', function($img_details, $url) {
      if ($img_details !== false) return $img_details;
      if (!filter_var($url, FILTER_VALIDATE_URL)) return false;

      $uploads_url = wp_upload_dir()['baseurl'];
      $uploads_normalized = preg_replace('#^https?://#', '', $uploads_url);
      $url_normalized = preg_replace('#^https?://#', '', $url);

      return (strpos($url_normalized, $uploads_normalized) === 0) ? false : [];
  }, 10, 2);

Suggestion: Consider adding URL validation before calling file_get_contents() or gracefully handling 404 responses to prevent warnings on missing images.

Thanks!