PHP array_change_key_case()Functions

Examples

Convert all keys of an array to uppercase:

<?php $age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43"); print_r(array_change_key_case($age,CASE_UPPER)); ?>

The array_change_key_case() function converts all keys of an array to uppercase or lowercase letters.

array_change_key_case(array,case);

Parameters	Description
array	Required. Specifies the array to use.
case	Optional. Possible values: CASE_LOWER - Default value. Converts the array keys to lowercase letters. CASE_UPPER - Converts the array keys to uppercase letters.

Return value:	Returns an array with lowercase keys, or an array with uppercase keys, or ifarrayit is not an array, returns FALSE.
PHP Version:	4.2+

Convert all keys of an array to lowercase:

<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_LOWER));
?>

If, after running array_change_key_case(), two or more keys are the same (e.g. "b" and "B"), the last element will override the other elements:

<?php
$pets=array("a"=>"Cat","B"=>"Dog","c"=>"Horse","b"=>"Bird");
print_r(array_change_key_case($pets,CASE_UPPER));
?>