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<?php $html = <<<STR <html><body> <a href="http://www.test.org/5521" rel="follow">test1</a><br/> <a href="http://www.test.org/5522" rel="external">test1</a><br/> <a href="http://www.test.org/5523">test1</a> </body></html> STR; $dom = new DOMDocument('1.0', 'UTF-8'); $dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); $links = $dom->getElementsByTagName("a"); foreach($links as $link) { $link->setAttribute('rel', 'nofollow'); } echo $dom->saveHTML();
Output for git.master, git.master_jit, rfc.property-hooks
<html><body> <a href="http://www.test.org/5521" rel="nofollow">test1</a><br> <a href="http://www.test.org/5522" rel="nofollow">test1</a><br> <a href="http://www.test.org/5523" rel="nofollow">test1</a> </body></html>

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