futtta / autoptimize

        $preconns = array();

        // Get settings and store in array.

        if ( array_key_exists( 'autoptimize_extra_text_field_2', $options ) ) {

            $preconns = array_filter( array_map( 'trim', explode( ',', $options['autoptimize_extra_text_field_2'] ) ) );

        }

        $preconns = apply_filters( 'autoptimize_extra_filter_tobepreconn', $preconns );

        // Walk array, extract domain and add to new array with crossorigin attribute.

        // make array from comma separated list.

        $options  = $this->options;

        $preloads = array();

        if ( array_key_exists( 'autoptimize_extra_text_field_7', $options ) ) {

            $preloads = array_filter( array_map( 'trim', explode( ',', $options['autoptimize_extra_text_field_7'] ) ) );

        }

        $preloads = apply_filters( 'autoptimize_filter_extra_tobepreloaded', $preloads );

        // immediately return if nothing to be preloaded.