how to see xml preview in browser php

xml preview view in browser

$xml = new DOMDocument('1.0', 'UTF-8');
                $xml->preserveWhiteSpace = false;
                $xml->formatOutput = true;
                $xml_data = $xml->createElement("DATA");
 $xml_row = $xml->createElement("ROW","test");
                                        $xml_data->appendChild( $xml_row );
 $str = $xml->saveXML();
                $str = "

".htmlspecialchars($str)."

";


xml not allowed character list

public function xmlEscape($string) {
        return str_replace(array('&', '<', '>', '\'', '"'), array('&', '<', '>', ''', '"'), $string);
    }


xml add html data in value
$xml_sub_col = $xml->createElement("ITEM");
$xml_sub_col->appendChild($xml->createCDATASection( "test"));

add attrubute in xml
$xml_sub_col->setAttribute("id",$arrValSubCol[0]);