PHP foreach 数组键

Question

有个数组，如何让数组key和id一致？

Array
(
    [0] => Array
        (
            [id] => 1
            [title] => Phones
            [parent] => 0
        )

    [1] => Array
        (
            [id] => 2
            [title] => Apple
            [parent] => 1
        )

    [2] => Array
        (
            [id] => 5
            [title] => Samsung
            [parent] => 1
        )
)

我试过这样做，结果反过来，id 变成了数组键。应该是反过来的。

foreach ($statement as $key => $value) {
    $statement[$key]['id'] = $key;
}

Answer 1

foreach($array as $key => $val){
 $new_array[$val['id']] = $val;
}

$array = $new_array;

Answer 2

你弄错的部分是$key的用法。请看 $key 是指主数组的键，即 0、1、2。

Since we need the value corresponding to key id, $value['id'] becomes the key of our result array $newArray. Just use a new variable and store it in that.

代码：

$newArray = array();
foreach ($statement as $value) {
    $newArray[$value['id']] = $value;
}

输出：

 Array
(
   [1] => Array
    (
        [id] => 1
        [title] => Phones
        [parent] => 0
    )
   [2] => Array
    (
        [id] => 2
        [title] => Apple
        [parent] => 1
    )

    [5] => Array
     (
        [id] => 5
        [title] => Samsung
        [parent] => 1
      )
)

PHP foreach 数组键

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