PHP array_change_key_case() Function

From http://www.w3schools.com (Copyright Refsnes Data)

# PHP array_change_key_case() Function

Complete PHP Array Reference

## Definition and Usage

The array_change_key_case() function returns an array with all array KEYS in lower case or upper case.

## Syntax

    array_change_key_case(array,case)

Parameter | Description
--- | ---
array | Required. Specifies the array to use

case

Optional. Possible values:

- CASE_LOWER - Deafult value. Returns the array key values in lower case.
- CASE_UPPER - Returns the array key values in upper case.

## Tips and Notes

Note: If two or more array keys will be the same after running this function, the last array will override the others. (See example 2)

## Example 1

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

The output of the code above will be:

    Array ( [A] => Cat [B] => Dog [C] => Horse )

## Example 2

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

The output of the code above will be:

    Array ( [A] => Cat [B] => Bird [C] => Horse )

Complete PHP Array Reference

From http://www.w3schools.com (Copyright Refsnes Data)