easy as it does
not much to configure with prettifier highlighter
1.download and see the instruction here
2. copy these code and paste befor </head>
<link href='YOUR_SITE/prettify.css' rel='stylesheet' type='text/css'/> <script src='YOUR_SITE/prettify.js' type='text/javascript'/>3) Wrap your code and Remember to replace < with <lt; , & with &
<pre class="prettyprint">
<?php
    //comment start here
    /*and can start here*/
    #and here
    class Highlighters() {
        function result($highlighter) {
            switch ($highlighter) {
               case "chili":
               default:
                  return "FTL";
               case "syntaxhighlighter":
                  return "FTW";
            }
        }
    }
 for($i=0;$i<10;$i++){
  print_r($_POST[$i])
  return true;
  return null;
 }
    $highlighters = new Highlighters();
    printf("Chili is a nice effort, but just not for me.  Chili %s", $highlighters->result("chili"));
    printf("I am going to give SyntaxHighlighter a shot.  SyntaxHighlighter %s", $highlighters->result("syntaxhighlighter"));
?>
<HTML>
<BODY onload='init();'>
TESTING HELLO WORLD
</BODY>
</HTML>
</pre>
the css is not pretty as its name but you can modify is yourself
From: http://code.google.com/p/google-code-prettify/
