Question

我想取消设置数组值而不是键

在：

Array
(
    [0] => Array
        (
            [id] => 45
            [type] => 1
            [lgsize] => 10
            [lgid] => 9
            [rank] => 4
            [winprize] => 3000
        )
[1] => Array
        (
            [id] => 46
            [type] => 1
            [lgsize] => 10
            [lgid] => 9
            [rank] => 4
            [winprize] => 2000
        )
)

后：

Array
(
    [0] => Array
        (
            [id] => 45
            [type] => 1
            [lgsize] => 10
            [lgid] => 9
            [rank] => 4
            [winprize] => 
        )
[1] => Array
        (
            [id] => 46
            [type] => 1
            [lgsize] => 10
            [lgid] => 9
            [rank] => 4
            [winprize] => 
        )
)

Answer 1

我认为 数组长度 可以增加

如下所示： -

foreach($array as &$arr){ // iterate over array
   $arr['winprize'] = ''; // empty value of desired key
}

输出： - https://eval.in/847434

Answer 2

另一种方法是使用sizeof函数

for($i = 0; $i < sizeof($array); $i++) {
  $array[$i]['winprize'] = '';
}

Answer 3

在循环中请留空。

e.g。

$array[0]['winprize'] = '';

Answer 4

或者，您也可以使用array_map()：

<?php

$data = array(
    array(
        'id' => 45,
        'type' => 1,
        'lgsize' => 10,
        'lgid' => 9,
        'rank' => 4,
        'winprize' => 3000,
    ),
    array(
        'id' => 46,
        'type' => 1,
        'lgsize' => 10,
        'lgid' => 9,
        'rank' => 4,
        'winprize' => 2000,
    ),
);

$cleaned = array_map(function (array $element) {
    // only set null as value if the key actually exists
    if (array_key_exists('winprize', $element)) {
        $element['winprize'] = null;
    }

    return $element;
}, $data);

var_dump($cleaned);

供参考，见：

有关示例，请参阅：

https://3v4l.org/EskKq

如何将多维数组中某些键的值设置为null？

4 个答案: