array_change_key_case()

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

将数组中的所有键名修改为全大写或小写

说明

array_change_key_case()将$array数组中的所有键名改为全小写或大写。本函数不改变数字索引。

参数

需要操作的数组。

可以在这里用两个常量，CASE_UPPER或CASE_LOWER（默认值）。

返回值

返回一个键全是小写或者全是大写的数组；如果输入值（$array）不是一个数组，那么返回FALSE

错误／异常

如果输入值（$array）不是一个数组，就会抛出一个错误警告（E_WARNING）。

范例

Example #1array_change_key_case()例一

以上例程会输出：

Array
(
    [FIRST] => 1
    [SECOND] => 4
)

注释

如果一个数组中的多个键名经过本函数后变成一样的话（例如"keY"和"kEY"），最后一个值将覆盖其它的值。

Here is the most compact way to lower case keys in a multidimensional array
function array_change_key_case_recursive($arr)
{
  return array_map(function($item){
    if(is_array($item))
      $item = array_change_key_case_recursive($item);
    return $item;
  },array_change_key_case($arr));
}

Unicode example;

Array
(
  [FIRST] => 1
  [YAğ] => Oil
  [şEKER] => sugar
)
Array
(
  [FIRST] => 1
  [YAĞ] => Oil
  [ŞEKER] => sugar
)

I improve the array_change_key_case_recursive function ,let it can lowercase or uppercase keys
function array_change_key_case_recursive($arr, $case = CASE_LOWER)
{
  return array_map(function($item) use($case) {
    if(is_array($item))
      $item = array_change_key_case_recursive($item, $case);
    return $item;
  },array_change_key_case($arr, $case));
}

multibyte and multi-dimensional-array support, have fun! 

Script to change case of sub-arrays keys to lower . It works well for me. hope it helps. 

Below is a recursive version of this function.

Result:
Array ( [MoreFoo] => Array ( [More] => foo ) [Foo] => bar )

outputs:
array(3) {
 ["id"]=>
 int(1)
 ["name"]=>
 string(4) "Luis"
 ["contact"]=>
 array(2) {
  ["PHONE"]=>
  string(9) "3010-7148"
  ["E-MAIL"]=>
  string(12) "luis@net.com"
 }
}
array(3) {
 ["id"]=>
 int(1)
 ["name"]=>
 string(4) "Luis"
 ["contact"]=>
 array(2) {
  ["phone"]=>
  string(9) "3010-7148"
  ["e-mail"]=>
  string(12) "luis@net.com"
 }
}

Recursive LowerCase First Letter in array key
if(!function_exists("mb_lcfirstKeys")) {
  function mb_lcfirstKeys($data) {
    $res = [];
    foreach ($data as $key => $value) {
      $newKey = mb_lcfirst($key);
      $res[$newKey] = is_array($value) ? mb_lcfirstKeys($value) : $value;
    }
    return $res;
  }
}

function convert_to_key_case($data, $case){
    $condition = ($case == 'lowercase')? 'lowercase' : 'uppercase';
    $test = [];
    foreach($data as $key => $value) {
      if ($condition == 'lowercase') {
        $test[strtolower($key)] = $value;
      } else {
        $test[strtoupper($key)] = $value;
      }
    }
  return $test;
}
$input = ['test1'=>1, 'Test2' => 2, 'TeSt3' => 3];
print_r(convert_to_key_case($input, 'uppercase'));
print_r(convert_to_key_case($input, 'lowercase'));
OUTPUT
Array 
(
 [TEST1] => 1
 [TEST2] => 2 
 [TEST3] => 3 
)
Array ( 
 [test1] => 1
 [test2] => 2
 [test3] => 3
 )

I just changed the code a little bit so you havent got a code that repeats itself.

outputs:
array(3) {
 ["id"]=>
 int(1)
 ["name"]=>
 string(4) "Luis"
 ["contact"]=>
 array(2) {
  ["phone"]=>
  string(9) "3010-7148"
  ["e-mail"]=>
  string(12) "luis@net.com"
 }
}

Simple function to change multidimensional array's all values to uppercase. If you would like to change to lowercase then change "mb_strtoupper" to "mb_strtolower". It works perfect for me ;) 

Same as array_change_key_case only with the values. This should really be part of PHP! 

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