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    <p>Static class members (or any other variables for that matter) are not preserved across different requests. Never.</p> <h2>Sessions to the rescue</h2> <p>The only exception to this is <code>$_SESSION</code>; which is a special mechanism to allow for just that.</p> <p>Star the session with <a href="http://www.php.net/manual/en/function.session-start.php" rel="nofollow"><code>session_start()</code></a> at the top of your script.</p> <p>You can now use <code>$_SESSION</code> like a regular array to store and retrieve information. A session belongs to a single user, it is not a means of sharing data across all your users.</p> <p>Have a look <a href="http://www.php.net/manual/en/session.examples.basic.php" rel="nofollow">here</a> for an introduction.</p> <h2>Silence</h2> <p>You must not output anything before <code>session_start()</code> is called. That is to say, <code>&lt;?php</code> must be the exact first thing in a PHP script that wishes to use sessions. Further, there must be no echo statements or any other output generating functions between <code>&lt;?php</code> and <code>session_start()</code>.</p> <h2>Output Buffering</h2> <p>If you really must generate output before starting the session, you can use <a href="http://php.net/manual/en/function.ob-start.php" rel="nofollow">output buffering</a>.</p> <h2>Notes</h2> <ul> <li><code>$_SESSION</code> is forgetful. After a certain <a href="http://www.php.net/manual/en/session.configuration.php#ini.session.gc-maxlifetime" rel="nofollow">time</a> of inactivity on the user's side, the data will be deleted.</li> <li>If you get the following error message, you violated the above guidelines. Another possibility is that your script has a BOM (Unicode byte order mark). If so, remove it.</li> </ul> <blockquote> <p>Warning: session_start(): Cannot send session cookie - headers already sent by (output started at</p> </blockquote> <p>The reason this happens is due to the way PHP handles output: It tries to get the output as fast as possible to the user. However, the HTTP protocol transmits certain control data (cookies, which session belongs to you etc), called "headers" before all the output ("body") of the response. As soon as you output anything, the headers need to get sent - unless you use output buffering that is.</p>
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    1. COThanks for the heads up. I am quite familiar with sessions. I was just reading up on design patterns ,OOP and how it would integrate into a real life example.
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    2. CO@user866190 Oh, I see :) markus-tharkun has the right of it, take a look at the post linked by him and all the links therein.
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