link_no1
link_no2
DATA;
$dom = new DOMDocument('1.0', 'UTF-8');
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
$links = $xpath->query('//a');
foreach($links as $link) {
$link->setAttribute('target', '_blank');
}
echo $dom->saveHTML();