title: PHP Startup: Unable to load dynamic library php_msgpack_serialize
body: <pre><code>PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/20131226/memcached.so' - /usr/lib/php/20131226/memcached.so: undefined symbol: php_msgpack_serialize in Unknown on line 0
  </code></pre>
  
  <p>Earlier today, I enabled forwarding of messages to root@localhost on my server to beam back to my personal email.</p>
  
  <p>I have been receiving the above error message at 30 minutes intervals since. Of course, I checked and there's a PHP session cleaning script attached to cron to run at 30 minutes interval.</p>
  
  <p>I have been searching around but couldn't find any specific solution.</p>
  
  <p>My setup:</p>
  
  <ul>
  <li>memcached 1.4.25 </li>
  <li>PHP 7.0 </li>
  <li>nginx/1.10.0 </li>
  <li>mysql  Ver 14.14 Distrib 5.7.13</li>
  <li>Ubuntu Server LTS 16.04</li>
  </ul>
  
  <p>The closest I found to my issue above was this: <a href="http://community.rtcamp.com/t/php-warning-error-php-msgpack-serialize/6262" rel="noreferrer">http://community.rtcamp.com/t/php-warning-error-php-msgpack-serialize/6262</a> but there's no answer on that thread.</p>