PHP删除具有相同键的项目，除了具有最低值的项目

我有下面的数组，我想从得到相同time的数组中删除元素，但只保留最低amount的元素，我知道排序函数，但我不确定如何使代码与删除离开的元素一起工作，谢谢这方面的赞赏指南和god 保佑.周末快乐.

array(
    array(
        "hash" => 0x111,
        "sender" => 0x11111,
        "amount" => 0.015,
        "time" => 1683896236
    ),
    array(
        "hash" => 0x222,
        "sender" => 0x22222,
        "amount" => 0.055,
        "time" => 1683896236
    ),
    array(
        "hash" => 0x333,
        "sender" => 0x33333,
        "amount" => 0.075,
        "time" => 1683896236
    ),
    array(
        "hash" => 0x444,
        "sender" => 0x44444,
        "amount" => 0.6666,
        "time" => 1683896237
    )
)

Code:个

我try 了什么:

$this_array = explode("\n", $this_str);
$keep_array = array();

foreach($this_array as $ta) {
    $break = explode("###", $ta);

    $this_hash = $break[0];
    $this_sender = $break[1];
    $this_amount = $break[2];
    $this_time = $break[3];

    if (!array_key_exists($this_time, $keep_array)) {
        echo "This time $this_time does not exist \n";
        $keep_array[$this_time] = $this_amount;
    } else {
        if ($this_amount < $keep_array[$this_time]) {
            echo "This time $this_time exist \n";
            $keep_array[$this_time] == $this_amount;
        }
    }
}

print_r($keep_array);

我得到的回应是:

Array
(
    [1683896236] => 0.01596236
    [1683896237] => 0.6666
)

预期响应为2个数组

第一个数组密钥=1683896236 值为0.015(所有相同时间的最低值为1683896236)

第二个数组密钥=1683896237 值为0.6666

我不知道该怎么做

1. 查找所有具有相同"时间"的数组
2. 比较它们的"Amount"值，只保留"Amount"最小的同一时间的数组元素
3. 将从数组中删除/取消设置相同"时间"的较高"量"

Updated with codes given on this post个 我用这样的数据集进行了try

0x1###0x1###0.143523304620325378###1683911769
0x2###0x2###0.374362###1683911787
0x3###0x3###0.014925###1683911787
0x4###0x4###1.206308057843180009###1683911787

结果将是

Array
(
    [0] => Array
        (
            [hash] => 0x1
            [sender] => 0x1
            [amount] => 0.143523304620325378
            [time] => 1683911769
        )

    [1] => Array
        (
            [hash] => 0x3
            [sender] => 0x3
            [amount] => 0.014925
            [time] => 1683911787
        )

    [2] => Array
        (
            [hash] => 0x4
            [sender] => 0x4
            [amount] => 1.206308057843180009
            [time] => 1683911787
        )

)

预计1683911787个"时间"中只有1个，但结果显示2.1个N中的1个应该是减go 后数组中的唯一一个.