title: Call to undefined function mcrypt_decrypt() - even when php5-mcrypt installed
body: <p>So I can't stop getting the error:</p>
  
  <pre><code>PHP Fatal error:  Call to undefined function mcrypt_decrypt() in 
  </code></pre>
  
  <p>Even when I have php5_mcrypt installed, I've reinstalled php quite a few times but I can't get it working!</p>
  
  <p>More info:</p>
  
  <pre><code>mandatory@mandatorys-box:~/Desktop/bots$ dpkg -l | grep php
  ii  libapache2-mod-php5                       5.5.3+dfsg-1ubuntu2.1                      amd64        server-side, HTML-embedded scripting language (Apache 2 module)
  ii  php5                                      5.5.3+dfsg-1ubuntu2.1                      all          server-side, HTML-embedded scripting language (metapackage)
  ii  php5-cli                                  5.5.3+dfsg-1ubuntu2.1                      amd64        command-line interpreter for the php5 scripting language
  ii  php5-common                               5.5.3+dfsg-1ubuntu2.1                      amd64        Common files for packages built from the php5 source
  ii  php5-curl                                 5.5.3+dfsg-1ubuntu2.1                      amd64        CURL module for php5
  ii  php5-json                                 1.3.1+dfsg-2                               amd64        JSON module for php5
  ii  php5-mcrypt                               5.4.6-0ubuntu3                             amd64        MCrypt module for php5
  ii  php5-mysql                                5.5.3+dfsg-1ubuntu2.1                      amd64        MySQL module for php5
  ii  php5-readline                             5.5.3+dfsg-1ubuntu2.1                      amd64        Readline module for php5
  </code></pre>
  
  <p>No idea what the problem is, tried everything.</p>
  
  <p>More info:</p>
  
  <pre><code>mandatory@mandatorys-box:~/Desktop/bots$ php -v
  PHP 5.5.3-1ubuntu2.1 (cli) (built: Dec 12 2013 04:24:35) 
  Copyright (c) 1997-2013 The PHP Group
  Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies
      with Zend OPcache v7.0.3-dev, Copyright (c) 1999-2013, by Zend Technologies
  </code></pre>