title: Fatal error: Class 'Memcached' not found in /my/path
body: <p>When I try :</p>
  
  <pre><code>$mc= new Memcached();
  </code></pre>
  
  <p>I get</p>
  
  <pre><code>Fatal error: Class 'Memcached' not found in /my/path
  </code></pre>
  
  <p>phpinfo says that /etc/php5/apache2/conf.d/20-memcached.ini is loaded as an additional .ini file.</p>
  
  <p>The content of this file is this one :</p>
  
  <pre><code>; uncomment the next line to enable the module
  extension=memcached.so
  </code></pre>
  
  <p>dpkg --get-selections | grep memcached</p>
  
  <pre><code>libmemcached6                                   install
  memcached                                       install
  php5-memcached                                  install
  </code></pre>
  
  <p>Kubuntu
  Apache 2.0
  php 5.4.4-1</p>
  
  <p>Why do I have this fatal error ?</p>