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copied!<p>If you'd like to abstract all the nasty parsing away from your script you can always use a <a href="http://en.wikipedia.org/wiki/Document_Object_Model" rel="nofollow noreferrer">DOM</a> parser of which there are <a href="https://stackoverflow.com/a/3577662/1238344">many available</a>. For this example I've opted for <a href="http://simplehtmldom.sourceforge.net/" rel="nofollow noreferrer">Simple HTML-DOM</a> as It's the only one I'm actually familiar with (it's admittedly not the most efficient library but you aren't doing anything intensive).</p> <pre><code>include 'simple_html_dom.php'; $html = str_get_html($htmlString); foreach($html->find('a') as $a){ $url = strtolower($a->href); if( strpos($url, 'http://me.com') === 0 || strpos($url, 'http://www.me.com') === 0 || strpos($url, 'http://') !== 0 // local url ){ $url = explode('?', $url, 2); if(count($url)<2) $qry = array(); else parse_str($url[1], $qry); $qry = array_merge($qry, array( 'utm' => 'some', 'medium' => 'stuff' )); $parts = array(); foreach($qry as $key => $val) $parts[] = "{$key}={$val}"; $a->href = sprintf("%s?%s", $url[0], implode('&', $parts)); } } echo $html; </code></pre> <p>In this example I've assumed that <em>me.com</em> is your website and that local paths should also qualify. I am also assuming that query strings are likely to be simple <em>key:value</em> pairs. In it's current form, if a URL already has one of your query parameters then it is over-written. If you'd like to retain the existing values then you will need to swap the order of the parameters in the <code>array_merge</code> function.</p> <h2>input:</h2> <pre><code><a href="http://me.com/">test</a> <a href="http://WWW.me.com/">test</a> <a href="local.me.com.php">test</a> <a href="http://notme.com">test</a> http://me.com/not-a-link <a href="http://me.com/?id=10&utm=bla">test</a> </code></pre> <h2>output:</h2> <pre><code><a href="http://me.com/?utm=some&medium=stuff">test</a> <a href="http://www.me.com/?utm=some&medium=stuff">test</a> <a href="local.me.com.php?utm=some&medium=stuff">test</a> <a href="http://notme.com">test</a> http://me.com/not-a-link <a href="http://me.com/?id=10&utm=some&medium=stuff">test</a> </code></pre>

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