PHP二维数组去重复项函数

function unique_arr($array2D){
  foreach ($array2D as $v){
         $v = join(",",$v); //降维,也可以用implode,将一维数组转换为用逗号连接的字符串
         $temp[] = $v;
     }
     $temp = array_unique($temp);    //去掉重复的字符串,也就是重复的一维数组
    foreach ($temp as $k => $v){
        $temp[$k] = explode(",",$v);   //再将拆开的数组重新组装
    }
  return $temp;
}