php如何去掉二维数组中重复的元素

$arr=array(
"1"=>array("a","b "),
"2"=>array("a","c"),
"3"=>array("a","b")
);
实现结果:

$arr=array(
"1"=>array("a","b "),
"2"=>array("a","c"),
);

function remove_duplicate($array){ $result=array(); for($i=0;$i<count($array);$i++){ $source=$array[$i]; if(array_search($source,$array)==$i && $source<>"" ){ $result[]=$source;        }    } return $result;}