Ok, thank you guys. For the records; I found <a href="http://se.php.net/manual/sv/language.operators.php">http://se.php.net/manual/sv/language.operators.php</a> rather interesting, can I find something simular somewhere else than 
<a href="http://php.net">php.net</a>? The manual is really great, but it's always good to have mutliple sources.<br><br><div><span class="gmail_quote">2006/10/6, Maciek Perlinski &lt;<a href="mailto:maciej.perlinski@meant4.com">
maciej.perlinski@meant4.com</a>&gt;:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">You will learn tips&amp;tricks while coding. Just use a lot of 
<a href="http://php.net">php.net</a> . Watch<br>out for the difference in PHP 4 and 5 about references and in general OOP.<br><br>-----Original Message-----<br>From: Karoly Negyesi [mailto:<a href="mailto:karoly@negyesi.net">
karoly@negyesi.net</a>]<br>Sent: Friday, October 06, 2006 7:48 PM<br>To: <a href="mailto:development@drupal.org">development@drupal.org</a><br>Subject: Re: [development] PHP tips n tricks<br><br><a href="http://www.zend.com/zend/art/ref-count.php">
http://www.zend.com/zend/art/ref-count.php</a><br><br></blockquote></div><br>