How to replace the key of an array in php

How to replace the key of an array in php: You can use the array_combine() function to replace it, such as [array_combine($key_name,$arr_old);]. This function can merge two arrays and use one of the array elements as the key.

Function introduction:

array_combine() function creates a new array by merging two arrays, one of which is the key name. , the elements of another array are key values.

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Note:

The number of elements in the key name array and the key value array must be the same!

Code implementation:

// 需要替换 key 的数组
$arr_old = array(
    '0' => array('id' => 1, 'name' => 'Carroll'),
    '1' => array('id' => 2, 'name' => 'Chrdai'),
    '3' => array('id' => 3, 'name' => 'xiaodai'),
);

// 将新的key定义一个新数组
$key_name = array('key1','key2','key3');

// 现在开始替换
$arr_new = array_combine($key_name,$arr_old);

var_dump($arr_new);
/*
array (size=3)
  'key1' =>
    array (size=2)
      'id' => int 1
      'name' => string 'Carroll' (length=7)
  'key2' =>
    array (size=2)
      'id' => int 2
      'name' => string 'Chrdai' (length=6)
  'key3' =>
    array (size=2)
      'id' => int 3
      'name' => string 'xiaodai' (length=7)
*/

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