Definition
The array_change_key_case() function changes all keys in an array to lowercase or uppercase.
Syntax
array_change_key_case(array, case)
Parameters
| Parameter | Description |
|---|---|
array |
Required. Specifies the array to use |
case |
Optional. CASE_LOWER - Default value. Changes the keys to lowercase; CASE_UPPER - Changes the keys to uppercase |
Example
<?php
$countries = array("Mark" => "DE", "Jeff" => "PH", "Mike" => "RU");
array_change_key_case($countries, CASE_UPPER);
foreach($countries as $x => $x_value) {
echo "Name = " . $x . ", Country = " . $x_value;
echo "<br>";
}