PHP Fatal error: Class 'jsonserializable' not found in Unknown on line 0

Question

Ubuntu 16.04 PHP 7.0.4 Phalcon 2.1.x Zephir

$~: php -v
PHP Fatal error:  Class 'jsonserializable' not found in Unknown on line 0

When add phalcon.so in php.ini

Answer 1

Somehow I found the answer on and old bug report here: Segmentation fault after update to 2.1.x

The problem is that the phalcon extension is being loaded before the json extension, so I guess that you, as myself, added the extension=phalcon.so line in the main php.ini

What you have to do is add a file in /etc/php/7.0/mods-available called phalcon.ini with the line in it: extension=phalcon.so

Then you just go and make a softlink that points from /etc/php/7.0/cli/conf.d/50-phalcon.ini to that phalcon.ini file, (important to put a number higher than 20 so it gets loaded after the json extension) and that's it!

Repeat the process to any other configuration that you have for php (apache, nginx, etc).