PHP array_change_key_case() Function
Example
Change all keys in an array to uppercase:
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_UPPER));
?>
Run example »
Definition and Usage
The array_change_key_case() function changes all keys in an array to lowercase or uppercase.
Syntax
array_change_key_case(array,case);
| Parameter | Description |
|---|---|
| array | Required. Specifies the array to use |
| case | Optional. Possible values:
|
Technical Details
| Return Value: | Returns an array with its keys in lowercase or uppercase, or FALSE if array is not an array |
|---|---|
| PHP Version: | 4.2+ |
More Examples
Example 1
Change all keys in an array to lowercase:
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_LOWER));
?>
Run example »
Example 2
If two or more keys will be equal after running array_change_key_case() (e.g. "b" and "B"), the latest array will override the other:
<?php
$pets=array("a"=>"Cat","B"=>"Dog","c"=>"Horse","b"=>"Bird");
print_r(array_change_key_case($pets,CASE_UPPER));
?>
Run example »
❮ PHP Array Reference
