二维数组去除重复并且合并的问题？求大神指点

定义一个新的数组，判断group_time有一样的就往他的did压入数据,如弄成下标为对应group_time的数组，如['1517932800'=>['group_time'=>1517932800,'did'=>[1074008064,2147483647]]],然后遍历原数组，找到group_time对应下标did的数组压入数据，最后再将整个数组用array_values(),下标就是从0开始了。

方法一

function initArray(array $array)
{
    $newArray = [];
    foreach ($array as $item) {
        if (isset($newArray[$item['group_time']])) {
            $newArray[$item['group_time']]['did'][] = $item['did'];
        } else {
            $newArray[$item['group_time']] = ['group_time' => $item['group_time'], 'did' => [$item['did']]];
        }
    }
    return $newArray;
}

方法二

$newArray = [];
array_map(function ($item) use(&$newArray){
    if (isset($newArray[$item['group_time']])) {
        $newArray[$item['group_time']]['did'][] = $item['did'];
    } else {
        $newArray[$item['group_time']] = ['group_time' => $item['group_time'], 'did' => [$item['did']]];
    }
},$array);

希望能对你有帮助

$arr = [
["group_time" => 1517932800,
"did" => [
1074008064,
2147483647
]
],
[
"group_time" => 1517932802,
"did" => [
1074008061,
2147483642
]
],
[
"group_time" => 1517932802,
"did" => [
1074008063,
2147483646
]
]
];
$result_arr = array_reduce($arr,create_function('$result,$v', '$result[$v["group_time"]][]= $v["did"];return $result;'));