Newsletters: Filter - newsletters_emailbody_links Example

gistfile1.php

<?php

function emailbody_links($body = null, $history_id = null, $matches = null) {
	global $Html;
	
	if (!empty($matches)) {
		foreach ($matches[1] as $key => $value) {
			$pattern = '/[\'"](' . preg_quote($value, '/') . ')[\'"]/si';									
			$newlink = $Html -> retainquery('param1=value1', $value);
			$body = preg_replace($pattern, '"' . $newlink . '"', $body);
		}
	}
	
	return $body;
}

add_filter('newsletters_emailbody_links', 'emailbody_links', 10, 3);

?>