php 数组去除重复值

$arr=array(38,39,41,38,39,41,42,43);$c=array_count_values($arr);function foo($v){    global $c;    if($c[$v]==1){		  return true;	}	return false;}print_r(array_filter($arr,'foo'));

$ar = array(38, 39, 40, 41, 38, 39, 40, 41, 42, 43);foreach(array_count_values($ar) as $k=>$v)  if($v == 1) $res[] = $k;print_r($res);

$ar = array(38, 39, 40, 41, 38, 39, 40, 41, 42, 43);$t = array_intersect(array_count_values($ar), array(1));$t = array_intersect($ar, array_keys($t));print_r($t);