futtta / autoptimize

        }

        // background-image in inline style.

        if ( strpos( $out, 'background-image:' ) !== false && apply_filters( 'autoptimize_filter_imgopt_backgroundimages', true ) ) {

            $out = preg_replace_callback(

                '/style=(?:"|\')[^<>]*?background-image:\s?url\((?:"|\')?([^"\')]*)(?:"|\')?\)/',

                array( $this, 'replace_img_callback' ),

                $out

            );

        }

        // act on icon links.

        if ( ( strpos( $out, '<link rel="icon"' ) !== false || ( strpos( $out, "<link rel='icon'" ) !== false ) ) && apply_filters( 'autoptimize_filter_imgopt_linkicon', true ) ) {

    }

    public function process_bgimage( $in ) {

        if ( strpos( $in, 'background-image:' ) !== false && apply_filters( 'autoptimize_filter_imgopt_lazyload_backgroundimages', true ) ) {

            $out = preg_replace_callback(

                '/(<(?:article|aside|body|div|footer|header|p|section|span|table)[^>]*)\sstyle=(?:"|\')[^<>]*?background-image:\s?url\((?:"|\')?([^"\')]*)(?:"|\')?\)[^>]*/',

                array( $this, 'lazyload_bgimg_callback' ),

                $in

            );

            return $out;

        }

        return $in;

    }