如何在多维数组中找到相同的值并创建一个只有唯一值的新数组？

Question

我有一个存储了我的 MySQL 数据库结果的数组。

$time = "14:51:00"

Array
(
    [0] => Array
        (
            [name] => richard
            [id] => 61
            [chauffeurId] => 60
            [lat] => 53.0291365
            [lon] => 5.65739468598697
            [pickupdate] => 2021-01-25
            [departuretime] => 12:55:00
            [arrivalTime] => 13:46:00
            [finalDestination] => 5.81155877224893,52.9808856
        )

    [1] => Array
        (
            [name] => Jan
            [id] => 64
            [chauffeurId] => 63
            [lat] => 53.19968475
            [lon] => 5.80069089560234
            [pickupdate] => 2021-01-25
            [departuretime] => 12:45:00
            [arrivalTime] => 13:51:00
            [finalDestination] => 5.81155877224893,52.9808856
        )

    [2] => Array
        (
            [name] => richard
            [id] => 61
            [chauffeurId] => 60
            [lat] => 53.0291365
            [lon] => 5.65739468598697
            [pickupdate] => 2021-01-25
            [departuretime] => 13:49:00
            [arrivalTime] => 14:50:00
            [finalDestination] => 5.81155877224893,52.9808856
        )

    [3] => Array
        (
            [name] => joris
            [id] => 59
            [chauffeurId] => 58
            [lat] => 52.9026474
            [lon] => 5.59003021194087
            [pickupdate] => 
            [departuretime] => 
            [arrivalTime] => 
            [finalDestination] => 
        )

    [4] => Array
        (
            [name] => frans
            [id] => 60
            [chauffeurId] => 59
            [lat] => 53.018652
            [lon] => 5.533441
            [pickupdate] => 
            [departuretime] => 
            [arrivalTime] => 
            [finalDestination] => 
        )

    [5] => Array
        (
            [name] => henk
            [id] => 62
            [chauffeurId] => 61
            [lat] => 53.02030965
            [lon] => 5.53122986346911
            [pickupdate] => 
            [departuretime] => 
            [arrivalTime] => 
            [finalDestination] => 
        )

    [6] => Array
        (
            [name] => Joop
            [id] => 65
            [chauffeurId] => 64
            [lat] => 52.9026474
            [lon] => 5.59003021194087
            [pickupdate] => 
            [departuretime] => 
            [arrivalTime] => 
            [finalDestination] => 
        )

)

我在这个数组中有两个数组，它们具有相等的 ['chauffeurId']。 所以我只想要两者之一。我想要的，需要有最接近存储在 $time 变量中的时间的 ['arrivaltime']。

然后数组需要如下所示：

Array
(
    [0] => Array
        (
            [name] => Jan
            [id] => 64
            [chauffeurId] => 63
            [lat] => 53.19968475
            [lon] => 5.80069089560234
            [pickupdate] => 2021-01-25
            [departuretime] => 12:45:00
            [arrivalTime] => 13:51:00
            [finalDestination] => 5.81155877224893,52.9808856
        )

    [1] => Array
        (
            [name] => richard
            [id] => 61
            [chauffeurId] => 60
            [lat] => 53.0291365
            [lon] => 5.65739468598697
            [pickupdate] => 2021-01-25
            [departuretime] => 13:49:00
            [arrivalTime] => 14:50:00
            [finalDestination] => 5.81155877224893,52.9808856
        )

    [2] => Array
        (
            [name] => joris
            [id] => 59
            [chauffeurId] => 58
            [lat] => 52.9026474
            [lon] => 5.59003021194087
            [pickupdate] => 
            [departuretime] => 
            [arrivalTime] => 
            [finalDestination] => 
        )

    [3] => Array
        (
            [name] => frans
            [id] => 60
            [chauffeurId] => 59
            [lat] => 53.018652
            [lon] => 5.533441
            [pickupdate] => 
            [departuretime] => 
            [arrivalTime] => 
            [finalDestination] => 
        )

    [4] => Array
        (
            [name] => henk
            [id] => 62
            [chauffeurId] => 61
            [lat] => 53.02030965
            [lon] => 5.53122986346911
            [pickupdate] => 
            [departuretime] => 
            [arrivalTime] => 
            [finalDestination] => 
        )

    [5] => Array
        (
            [name] => Joop
            [id] => 65
            [chauffeurId] => 64
            [lat] => 52.9026474
            [lon] => 5.59003021194087
            [pickupdate] => 
            [departuretime] => 
            [arrivalTime] => 
            [finalDestination] => 
        )

)

有哪些方法可以做到这一点？

Answer 1

我能想到的最简单的方法：

$result = [];

foreach ($array as $data) {
    $id = &$data['chauffeurId'];
    $data['timeDiff'] = abs($time - strtotime($data['arrivalTime']));
    $result[$id] = !isset($result[$id]) || $result[$id]['timeDiff'] > $data['timeDiff']
        ? $data
        : $result[$id];
}

print_r(array_values($result));

---

但是如果你想使用排序：

按照时间差对数组进行排序，然后对数组进行迭代，存储每个id的时间差。 然后检查当前id是否已经迭代过，当前时间差大于你已经迭代过的，然后去掉。

$timeDiffs = [];

$time = strtotime("14:51:00");

usort($array, function ($item1, $item2) use ($time) {
    $diff1 = abs($time - strtotime($item1['arrivalTime']));
    $diff2 = abs($time - strtotime($item2['arrivalTime']));
    
    return $diff1 <=> $diff2;
});

foreach ($array as $key => $data) {
    $id = &$data['chauffeurId'];
    $timeDiff = abs($time - strtotime($data['arrivalTime']));
    
    
    if (isset($timeDiffs[$id]) && $timeDiff > $timeDiffs[$id]) {
        unset($array[$key]);
    } else {
        $timeDiffs[$id] = $timeDiff;
    }
}

print_r($array);