Example
Change all keys in an array to uppercase:
html
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_UPPER));
?>
Definition and Usage
The array_change_key_case() function changes all keys in an array to lowercase or uppercase.
Syntax
text
array_change_key_case(array, case)
Parameter Values
| Parameter | Description |
|---|---|
| array | Required. Specifies the array to use |
| case | Optional. Possible values: CASE_LOWER - Default value. Changes the keys to lowercase CASE_UPPER - Changes the keys to uppercase |
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
Change all keys in an array to lowercase:
html
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_LOWER));
?>
Example
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:
html
<?php
$pets=array("a"=>"Cat","B"=>"Dog","c"=>"Horse","b"=>"Bird");
print_r(array_change_key_case($pets,CASE_UPPER));
?>