PHP foreach 数组键

Question

有一个数组，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
        )
)

我尝试这样做，但结果反过来，id 变得与数组键相同。应该是相反的。

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

Answer 1

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

由于我们需要key id对应的值，$value['id'] 成为我们的结果数组 $newArray 的键。只需使用一个新变量 并将其存储在其中。

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
      )
)

Answer 2

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

$array = $new_array;