How to get the DN for a given samaccountname:/*the connecting part*/$ldap_conn = ldap_connect($hostname, $port);$bind = ldap_bind($ldap_conn, $username, $password);/*the connecting part*/$samaccountname = john.doe;$filter="(samaccountname=$samaccountname)";$dn="OU=PEOPLE, DC=example, DC=com"; //even if it seems obvious I note here that the dn is just an example, you'll have to provide an OU and DC of your own$res = ldap_search($ldap_conn, $dn, $filter);$first = ldap_first_entry($ldap_conn, $res);$data = ldap_get_dn($ldap_conn, $first);echo "The desired DN is: ".$data;