Wordpress: Get attachment ID from attachment url

gistfile1.txt

/**
	 * Ottengo l'ID di un attachment attraverso il suo URL
	 *
     * @param $url
     * @return int
     */
	public function get_attachment_id( $url )
    {
        $attachment_id = 0;
        $dir = wp_upload_dir();
        if (false !== strpos($url, $dir['baseurl'] . '/')) { // Is URL in uploads directory?
            $file = basename($url);
            $query_args = array(
                'post_type' => 'attachment',
                'post_status' => 'inherit',
                'fields' => 'ids',
                'meta_query' => array(
                    array(
                        'value' => $file,
                        'compare' => 'LIKE',
                        'key' => '_wp_attachment_metadata',
                    ),
                )
            );
            $query = new WP_Query($query_args);
            if ($query->have_posts()) {
                foreach ($query->posts as $post_id) {
                    $meta = wp_get_attachment_metadata($post_id);
                    $original_file = basename($meta['file']);
                    $cropped_image_files = wp_list_pluck($meta['sizes'], 'file');
                    if ($original_file === $file || in_array($file, $cropped_image_files)) {
                        $attachment_id = $post_id;
                        break;
                    }
                }
            }
        }
        return $attachment_id;
    }