Installation requirements incomplete

[anonymous-matomo-user]

Just installed piwik on a fresh ubuntu server 13.10 installation, and found that the piwik requirements list is incomplete: http://piwik.org/docs/requirements/

I got a blank page after installation. My logs show the following:
Apr 04 07:58:01.522986 2014 [pid 11563 10.0.3.1:57176 PHP Fatal error: Call to undefined function Piwik\json_decode() in /var/www/piwik/core/Translate.php on line 76
Apr 04 07:58:01.530556 2014 [pid 11563 10.0.3.1:57176 PHP Fatal error: Call to undefined function Piwik\Plugin\json_decode() in /var/www/piwik/core/Plugin/Manager.php on line 10

After installing php5-json, everything worked fine

[mattab]

Thanks for the report! we should use Common::json_encode instead of the default php function.

[mattab]

In 792de6b: Fixes #4951 Added php5-json to the list of required extensions

[mattab]

In 58faad9: Refs #4951