Example of syntax highlighing in PHP

<head>
<title>Array lookup, with check etc</title>
</head>
<body bgcolor=white>
Who lives where?<BR>
<?php
#%% Array_walk example. Also the difference between null and empty
function prwho($person,$addy) { 
        $person or $person = "no-one";
        print ("$person lives in $addy<BR>");
        }

$home = array( 1 => "John Smith",
    2 => "Daphne Jones",
    3 => "Ronald McDonald",
    4 => "",
    "221B" => "Sherlock Holmes",
    84 => "Pizza Hut" );

if ($house = $_GET[house]) {
    if ($home[$house]) {
        print ("In $house lives $home[$house]");
    } else {
        if (is_string($home[$house])) {                            
            print ("$house is empty");
        } else {
            print ("Don't know about $house");
        }
    }
} else {
    print ("So you want a street listing then?<BR>");
    array_walk($home,"prwho");

}
?>
</body>
How can I highlight my PHP program like this?

Example taken from our PHP Programming course
Well House Consultants, 2012
Training sample © 2012, WELL HOUSE CONSULTANTS LTD
This is http://www.wellho.net/demo/shigh.php4
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