How To Change case of all keys in an array ?

How to modify the case of an array’s keys In PHP, there is a specific buildin function. Function name :

array_change_key_case()

This function have two parameters.

Array – [the array whose keys will be changed case by case],
Case Type – [In this case there will be 2 wells. Ex: CASE_UPPER and CASE_LOWER]

However, CASE_LOWER is set the case type by default.

Example

<?php
    $input_array = array("name" => 'Istiaq Nirab', "Age" => "18+");
    print_r(array_change_key_case($input_array, CASE_UPPER));
?>

Result

Array (
 [NAME] => Istiaq Nirab
 [AGE] => 18+
)

Thanks 😊