combine key value with array_walk

combine_key_value.php

<?php 
$a = array(
	'email' => 'test@test.com',
  	'desc' =>  'Who know',
  	'button_link' =>  'yest'
);

function qh_combine(&$item, $key){
	$item = "$key : $item";
}

array_walk($a, 'qh_combine');

print_r($a);
?>