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<h1>PHP Sessions</h1>
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<p class="intro">A PHP session variable is used to store information about, or 
change settings for a user session. Session variables hold information about one 
single user, and are available to all pages in one application.</p>
<hr />

<h2>PHP Session Variables</h2>
<p>When you are working with an application, you open it, do some changes and 
then you close it. This is much like a Session. The computer knows who you are. 
It knows when you start the application and when you end. But on the internet 
there is one problem: the web server does not know who you are and what you do 
because the HTTP address doesn't maintain state.</p>
<p>A PHP session solves this problem by allowing you to store user information 
on the server for later use (i.e. username, shopping items, etc). However, session information is temporary and 
will be deleted after 
the user has left the website. If you need a permanent storage you may want to store the data in a database.</p>
<p>Sessions work by creating a unique id (UID) for each 
visitor and store variables based on this UID. The UID is either stored in a 
cookie or is propagated in the URL.</p>
<hr />

<h2>Starting a PHP Session</h2>
<p>Before you can store user information in your PHP session, you must 
first start up the session.</p>
<p><b>Note:</b> The session_start() function must appear BEFORE the &lt;html&gt; tag:</p>
<table width="100%" border="1" class="ex" cellspacing="0" id="table6"><tr><td>
<pre>&lt;?php session_start(); ?&gt;</pre>
<pre>&lt;html&gt;
&lt;body&gt;</pre>
<pre>&lt;/body&gt;
&lt;/html&gt;</pre>
</td></tr></table>
<p>The code above will register the user's session with the server, allow you to 
start saving user information, and assign a UID 
for that user's session.</p>
<hr />

<h2>Storing a Session Variable</h2>
<p>The correct way to store and retrieve session variables is to use the 
PHP $_SESSION variable:</p>
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<pre>&lt;?php
session_start();
// store session data
$_SESSION['views']=1;
?&gt;</pre>
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