同样抄袭的带认证的 ZEND+FLEX

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## http://calisza.wordpress.com/2008/09/23/simple-php-wrapper-class-for-zend-session/    ##

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## [Simple PHP wrapper class for Zend Session][Simple PHP wrapper class for Zend_Session] ##

Posted by [calisza][] on September 23, 2008

I’ve been rather busy lately writing a new personal CMS based loosely on the excellent [Zend Framework][] .

One of the decisions I had to make was on how to handle session data, usually an overlooked yet very important aspect to any interactive website today. Fortunately, Zend Framework makes this a very easy decision to make with the introduction of their Zend\_Session management component.

The problem with frameworks though, is that you risk tying your code up too tightly with that of the framework itself. What happens when that bigger, better and shinier framework comes out ? Do you rewrite everything – again, or do you just resign yourself to using the old system until it’s well past it’s sell by date ?

While you cannot avoid the entanglement all together (you *do* need to make use of the framework after all), you can add abstraction layers – within reason.

It’s with this in mind that I created the following abstraction class. If I ever decided to use some other package/component to manage my sessions, I’d only have to edit code in one place – the class itself.

Keep in mind that this is an extremely basic example and should be treated as such.  
I’m also going to assume the following:

*  You have installed [Zend Framework and set up the necessary include paths][]
 *  You have read the [documentation pertaining to Zend\_Session][documentation pertaining to Zend_Session]

First our session wrapper/abstraction class :

[view source][]

[print][] [?][Link 1]

<table> 
 <tbody> 
  <tr> 
   <td><code>02</code> </td> 
   <td><code>require_once</code> <code>(</code> <code>"Zend/Session.php"</code> <code>);</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>04</code> </td> 
   <td><code>class</code> <code>SessionWrapper { </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>05</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>protected</code> <code>static</code> <code>$_instance</code> <code>;</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>06</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>public</code> <code>$namespace</code> <code>= null;</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>08</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>private</code> <code>function</code> <code>__construct() { </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>09</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>/* Explicitly start the session */</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>10</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>Zend_Session::start();</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>12</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>/* Create our Session namespace - using 'Default' namespace */</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>13</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>$this</code> <code>-&gt;namespace = </code> <code>new</code> <code>Zend_Session_Namespace();</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>15</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>/** Check that our namespace has been initialized - if not, regenerate the session id</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>16</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* Makes Session fixation more difficult to achieve</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>18</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>if</code> <code>(!isset(</code> <code>$this</code> <code>-&gt;namespace-&gt;initialized)) { </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>19</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>Zend_Session::regenerateId();</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>20</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>$this</code> <code>-&gt;namespace-&gt;initialized = true;</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>25</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* Implementation of the singleton design pattern</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>26</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* See <a href="http://www.talkphp.com/advanced-php-programming/1304-how-use-singleton-design-pattern.html" rel="nofollow">http://www.talkphp.com/advanced-php-programming/1304-how-use-singleton-design-pattern.html</a> </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>28</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>public</code> <code>static</code> <code>function</code> <code>getInstance() { </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>29</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>if</code> <code>(null === self::</code> <code>$_instance</code> <code>) { </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>30</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>self::</code> <code>$_instance</code> <code>= </code> <code>new</code> <code>self();</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>33</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>return</code> <code>self::</code> <code>$_instance</code> <code>;</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>37</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* Public method to retrieve a value stored in the session</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>38</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* return $default if $var not found in session namespace</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>39</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* @param $var string</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>40</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* @param $default string</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>41</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* @return string</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>43</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>public</code> <code>function</code> <code>getSessVar(</code> <code>$var</code> <code>, </code> <code>$default</code> <code>=null){ </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>44</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>return</code> <code>(isset(</code> <code>$this</code> <code>-&gt;namespace-&gt;</code> <code>$var</code> <code>)) ? </code> <code>$this</code> <code>-&gt;namespace-&gt;</code> <code>$var</code> <code>: </code> <code>$default</code> <code>;</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>48</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* Public function to save a value to the session</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>49</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* @param $var string</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>50</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>* @param $value</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>52</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>public</code> <code>function</code> <code>setSessVar(</code> <code>$var</code> <code>, </code> <code>$value</code> <code>){ </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>53</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>if</code> <code>(!</code> <code>empty</code> <code>(</code> <code>$var</code> <code>) &amp;&amp; !</code> <code>empty</code> <code>(</code> <code>$value</code> <code>)){ </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>54</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>$this</code> <code>-&gt;namespace-&gt;</code> <code>$var</code> <code>= </code> <code>$value</code> <code>;</code> </td> 
  </tr> 
 </tbody> 
</table>

Note that the class takes advantage of the [Singleton Design Pattern][] . What this means is that you only need to create an instance of the class once. You can then access that instance from anywhere within your project without having to either create yet another instance or include “global” objects/variables. [You can do some further reading here][] for a good tutorial and explanation on implementing the Singleton Design Pattern in PHP.

Also note that the class starts the session *explicitly* . This means that you’ll need to include and instantiate this class before ANY headers are sent to the browser (though this should be obvious to the more seasoned coder). If you get any “Cannot modify header information – headers already sent” errors, please go back and read the manual, make sure you understand [how PHP Sessions work][] and then come back to this post.

Now for some example usage :

[view source][]

[print][] [?][Link 1]

<table> 
 <tbody> 
  <tr> 
   <td><code>02</code> </td> 
   <td><code>// make sure SessionWrapper::getInstance() is called at least once in your bootstrap script</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>03</code> </td> 
   <td><code>// to make sure that the session is created before any headers are sent to browser</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>04</code> </td> 
   <td><code>$mySession</code> <code>= SessionWrapper::getInstance();</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>06</code> </td> 
   <td><code>// Set a session value</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>07</code> </td> 
   <td><code>$mySession</code> <code>-&gt;setSessVar(</code> <code>"example"</code> <code>, </code> <code>"my value"</code> <code>);</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>08</code> </td> 
   <td><code>// this is the same as saying</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>09</code> </td> 
   <td><code>$_SESSION</code> <code>[</code> <code>"Default"</code> <code>][</code> <code>"example"</code> <code>] = </code> <code>"my value"</code> <code>;</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>11</code> </td> 
   <td><code>// Print a session var to screen</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>12</code> </td> 
   <td><code>echo</code> <code>$mySession</code> <code>-&gt;getSessVar(</code> <code>"example"</code> <code>, </code> <code>"default value"</code> <code>);</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>13</code> </td> 
   <td><code>// outputs "my value" - same as saying the following</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>14</code> </td> 
   <td><code>echo</code> <code>$_SESSION</code> <code>[</code> <code>"Default"</code> <code>][</code> <code>"example"</code> <code>];</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>16</code> </td> 
   <td><code>// You can also use the following notation :</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>17</code> </td> 
   <td><code>SessionWrapper::getInstance()-&gt;getSessVar(</code> <code>"example"</code> <code>);</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>19</code> </td> 
   <td><code>// You can use the above code inside a function without having to 'global' $mySession</code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>20</code> </td> 
   <td><code>function</code> <code>myExample(){ </code> </td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td><code>21</code> </td> 
   <td><code>&nbsp;&nbsp;&nbsp;&nbsp;</code> <code>return</code> <code>SessionWrapper::getInstance()-&gt;getSessVar(</code> <code>"example"</code> <code>);</code> </td> 
  </tr> 
 </tbody> 
</table>

So, this may all seem pretty pointless at the moment, since you can access the Session directly through either $\_SESSION or create a new instance of Zend\_Session\_Namespace(). But – if for some reason you find a better session management package and want to move away from Zend\_Session – all you have to do is modify the SessionWrapper constructor method and it’s finished. No exhaustive search and replace necessary.

This entry was posted on September 23, 2008 at 2:10 pm and is filed under [PHP][] . Tagged: [class][] , [PHP][] , [session][] , [singleton][] , [wrapper][] , [zend framework][] . You can follow any responses to this entry through the [RSS 2.0][] feed. You can [leave a response][] , or [trackback][] from your own site.

[Simple PHP wrapper class for Zend_Session]: http://calisza.wordpress.com/2008/09/23/simple-php-wrapper-class-for-zend-session/
[calisza]: http://calisza.wordpress.com/
[Zend Framework]: http://framework.zend.com/
[Zend Framework and set up the necessary include paths]: http://framework.zend.com/docs/quickstart
[documentation pertaining to Zend_Session]: http://framework.zend.com/manual/en/zend.session.html
[view source]: http://calisza.wordpress.com/2008/09/23/simple-php-wrapper-class-for-zend-session/#viewSource
[print]: http://calisza.wordpress.com/2008/09/23/simple-php-wrapper-class-for-zend-session/#printSource
[Link 1]: http://calisza.wordpress.com/2008/09/23/simple-php-wrapper-class-for-zend-session/#about
[Singleton Design Pattern]: http://en.wikipedia.org/wiki/Singleton_pattern
[You can do some further reading here]: http://www.talkphp.com/advanced-php-programming/1304-how-use-singleton-design-pattern.html
[how PHP Sessions work]: http://www.php.net/session
[PHP]: http://en.wordpress.com/tag/php/
[class]: http://en.wordpress.com/tag/class/
[session]: http://en.wordpress.com/tag/session/
[singleton]: http://en.wordpress.com/tag/singleton/
[wrapper]: http://en.wordpress.com/tag/wrapper/
[zend framework]: http://en.wordpress.com/tag/zend-framework/
[RSS 2.0]: http://calisza.wordpress.com/2008/09/23/simple-php-wrapper-class-for-zend-session/feed/
[leave a response]: http://calisza.wordpress.com/2008/09/23/simple-php-wrapper-class-for-zend-session/#respond
[trackback]: http://calisza.wordpress.com/2008/09/23/simple-php-wrapper-class-for-zend-session/trackback/