Online PHP editor | refs for Qdl34

<?php $keywords = [ 'keywords' => 'www.1.com', 'hello' => 'www.2.com', 'there' => 'www.3.com', 'are' => 'www.4.com', ]; $sentence = ' <div> <h1>Hello</h1> <h2>Hello there blablabla</h2> <p>Hello, there are keywords</p> <p>Hello, there are keywords</p> <p>Hello, there are keywords</p> <p>Hello, there are keywords</p> <p>Hello, there are keywords</p> </div>'; $dom = new DOMDocument; $dom->loadHTML($sentence, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); foreach ($dom->getElementsByTagName('p') as $p) { $p->nodeValue = preg_replace_callback( '~\b(?:' . implode('|', array_keys($keywords)) . ')\b~i', function($m) use ($keywords) { return $keywords[strtolower($m[0])]; }, $p->nodeValue ); } echo $dom->saveHTML();