<?php $html = <<<HTML <body class="old_attr"> <div>(content)</div> </body> HTML; $new_class = "new_class_attr"; $dom=new DOMDocument; $dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); $body = $dom->getElementsByTagName('body')->item(0); if ($body->hasAttribute("class")) { $new_class = $body->getAttribute("class") . " " . $new_class; } $body->setAttribute("class", $new_class); echo $dom->saveHTML();
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