title: PHP Fatal error: Class 'jsonserializable' not found in Unknown on line 0
body: <p>Ubuntu 16.04
  PHP 7.0.4
  Phalcon 2.1.x
  Zephir</p>
  
  <pre><code>$~: php -v
  PHP Fatal error:  Class 'jsonserializable' not found in Unknown on line 0
  </code></pre>
  
  <p>When add phalcon.so in php.ini</p>