$cid = $_POST['cid'];
 $gid = $_POST['gid'];

mkdir('/home/user/public_html/ref/', 0777 );

mkdir('/home/user/public_html/ref/',$cid."_".$gid, 0777 );

mkdir('/home/user/public_html/ref/' . $cid . "_" . $gid, 0777);

mkdir('/home/user/public_html/ref/' . $cid . "_" . $gid, 0777, true);