php实现过滤多维数组中的重复值

来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/1343/viewspace-2827928/

function array_unique_new($arr) {
    $t = array_map('serialize', $arr);
    //利用serialize()方法将数组转换为以字符串形式的一维数组
    $t = array_unique($t);
    //去掉重复值
    $new_arr = array_map('unserialize', $t);
    //然后将刚组建的一维数组转回为php值
    return $new_arr;
}

$arr = [
                [
                    "userid" => 3,
                    "id" => 3,
                    "peoplenum" => 10
                ],
                [
                    "userid" => 4,
                    "id" => 4,
                    "peoplenum" => 4
                ],
                [
                    "userid" => 3,
                    "id" => 3,
                    "peoplenum" => 10
                ],
                [
                    "userid" => 5,
                    "id" => 5,
                    "peoplenum" => 6
                ]
            ];
      $new_arr = array_unique_new($arr);