<?php
$DOM = new DOMDocument();
$DOM->loadXML('<html><body><a href="/page?id=123">подробнее</a><a href="mailto:name@domain.com"><span><b>somename@domain.com</b></span></a><a href="http://d...content-available-to-author-only...n.com">domain.com</a></body></html>');
$list = $DOM->getElementsByTagName('a');
foreach($list as $link){
$href = $link->getAttribute('href');
}
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