Ticket #51058: attachment_url_to_postid.patch

function attachment_url_to_postid( $url ) {
        global $wpdb;

        $dir  = wp_get_upload_dir();
        $path = $url;

        $site_url   = parse_url( $dir['url'] );
        $image_path = parse_url( $path );
        $post_id = 0;

        if ( $attachment_id_pos = strpos( $url, '?attachment_id=' ) ) {
        // "plain" url (permalinks not enabled)
                $starting_pos = $attachment_id_pos + 15; // 15 = length of "?attachment_id="
                $post_id = substr( $url, $starting_pos );
        } elseif ( $attachment_id = url_to_postid( $url ) ) {
                // this is an attachment permalink
                $post_id = $attachment_id;
        } else {
                // compensate for sizes
        // reduce path to original filename
                $path_parts = explode( '-', $image_path['path'] );
                $filename = end( $path_parts );
                $found = preg_match('/^[\d]+x[\d]+(\.[0-9a-zA-Z]{3,4})/', $filename, $matches );
                if ( $found ) {
                        // size found
                        $meta_values[] = str_replace( '-' . $matches[0], $matches[1], $path );
                        $meta_values[] = str_replace( '-' . $matches[0], '-scaled'. $matches[1], $path );
                } else {
            // no size found
                        $meta_values[] = $path;
                        $extension = '.'. pathinfo( $path, PATHINFO_EXTENSION );
                        $meta_values[] = str_replace( $extension, '-scaled'. $extension, $path );
                }

                foreach( $meta_values as $key => $value ) {
                        // Force the protocols to match if needed.
                        if ( isset( $image_path['scheme'] ) && ( $image_path['scheme'] !== $site_url['scheme'] ) ) {
                                $meta_values[ $key ] = str_replace( $image_path['scheme'], $site_url['scheme'], $meta_values[ $key ] );
                        }
            // remove baseurl from path
                        if ( 0 === strpos( $meta_values[ $key ], $dir['baseurl'] . '/' ) ) {
                                $meta_values[ $key ] = substr( $meta_values[ $key ], strlen( $dir['baseurl'] . '/' ) );
                        }
                }

                $sql = 'SELECT `post_id`, `meta_value` FROM '. $wpdb->postmeta .' WHERE meta_key = "_wp_attached_file" AND ( `meta_value` = %s';
                if( isset( $meta_values[1] ) ) {
            // handle "-scaled" images
                        $sql .= ' OR `meta_value` = %s';
                }
                $sql .= ')';
                $sql = $wpdb->prepare( $sql, $meta_values );
                $results = $wpdb->get_results( $sql );

                if ( $results ) {
                        // Use the first available result, but prefer a case-sensitive match, if exists.
                        $post_id = reset( $results )->post_id;

                        if ( count( $results ) > 1 ) {
                                foreach ( $results as $result ) {
                    if( in_array( $result->meta_value, $meta_values) ) {
                                                $post_id = $result->post_id;
                                                break;
                                        }
                                }
                        }
                }

        }
        /**
         * Filters an attachment ID found by URL.
         *
         * @since 4.2.0
         *
         * @param int|null $post_id The post_id (if any) found by the function.
         * @param string   $url     The URL being looked up.
         */
        return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url );
}