Change value for each an array element with reference in PHP

Description

The following code shows how to change value for each an array element with reference.

Example

//from  ww w .j a  v  a2  s. co m
<?php
function myfunction(&$value,$key){
    $value="yellow";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction");
print_r($a);
?>

The code above generates the following result.