设置数组键值在数组内 - PHP Set Array Key to Value Inside that Array

PHP Set Array Key to Value Inside that Array

本文关键字：数组键值设置 | 更新日期: 2023-09-27

我有一个数组，它看起来像(var_dump):

array (size=3)
0 => 
   array (size=8)
  'id' => string '1' (length=1)
  'user_id' => string '64' (length=2)
  'level' => string '1' (length=1)
  'score' => string '9999' (length=4)
  't1' => string '1' (length=1)
  't2' => string '0' (length=1)
  't3' => string '0' (length=1)
  'attempts' => string '1' (length=1)
1 => 
  array (size=8)
  'id' => string '2' (length=1)
  'user_id' => string '64' (length=2)
  'level' => string '2' (length=1)
  'score' => string '123456789' (length=9)
  't1' => string '1' (length=1)
  't2' => string '1' (length=1)
  't3' => string '0' (length=1)
  'attempts' => string '4' (length=1)
2 => 
  array (size=8)
  'id' => string '3' (length=1)
  'user_id' => string '64' (length=2)
  'level' => string '3' (length=1)
  'score' => string '123456789' (length=9)
  't1' => string '1' (length=1)
  't2' => string '1' (length=1)
  't3' => string '0' (length=1)
  'attempts' => string '7' (length=1)

我如何改变键0,1,2等。是数组中level的值吗?

例如:

1 => 
   array (size=8)
  'id' => string '1' (length=1)
  'user_id' => string '64' (length=2)
  'level' => string '1' (length=1)
  'score' => string '9999' (length=4)
  't1' => string '1' (length=1)
  't2' => string '0' (length=1)
  't3' => string '0' (length=1)
  'attempts' => string '1' (length=1)
2 => 
  array (size=8)
  'id' => string '2' (length=1)
  'user_id' => string '64' (length=2)
  'level' => string '2' (length=1)
  'score' => string '123456789' (length=9)
  't1' => string '1' (length=1)
  't2' => string '1' (length=1)
  't3' => string '0' (length=1)
  'attempts' => string '4' (length=1)
3 => 
  array (size=8)
  'id' => string '3' (length=1)
  'user_id' => string '64' (length=2)
  'level' => string '3' (length=1)
  'score' => string '123456789' (length=9)
  't1' => string '1' (length=1)
  't2' => string '1' (length=1)
  't3' => string '0' (length=1)
  'attempts' => string '7' (length=1)

我已经尝试在forloop中重命名键，这不仅替换了键，而是替换了整个数组并使其留空。

谢谢

$arr = [ ['id'=>1], ['id'=>2],  ['id'=>3]];
$new = [];
foreach($arr as $item)  
    $new[$item['id']] = $item;
print_r($new);

结果

Array (
    [1] => Array ( [id] => 1)
    [2] => Array ( [id] => 2)
    [3] => Array ( [id] => 3)
}