Tryit Editor v2.3

PHP Source:

<!DOCTYPE html>
<html>
<body>

<?php
function myfunction($value,$key)
{
echo "The key $key has the value $value<br>";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction");
?>

</body>
</html>