- preg_match: documentation ( source)
- str_replace: documentation ( source)
- explode: documentation ( source)
<?php
$str = 'CN=van der Valk\, Marco,OU=UT,OU=NL,OU=EMEA,OU=associates,OU=usersAndGroups,DC=corporate,DC=ingrammicro,DC=com';
preg_match("/CN=([\w\s\\\\,]+),/", $str, $match);
List($lastname, $firstname) = explode(',', str_replace("\\", "", $match[1]));
Echo $firstname ." " . $lastname;