Missing JSON_PRESERVE_ZERO_FRACTION in php 5.6.8

I’m using php 5.6.8 on ubuntu 12.04, trying to json_encode($arr, JSON_PRESERVE_ZERO_FRACTION) but JSON_PRESERVE_ZERO_FRACTION is undefined. I thought maybe it was introduced in php-json 1.3.7+, so i tried to sudo apt-get install --only-upgrade php5-json, it tells me i have the newest version of php-json.

I’m using Ondřej Surý PPA as the source. Anyone have an idea what’s wrong?

Edit

I’ve also checked in php without any application (php -a), this constant is still undefined. So i don’t think it’s anything app-related.

Answer

Should be available in PHP 5.6.6+.

In case some of your tools complains about missing constant you can add polyfill:

if(!defined('JSON_PRESERVE_ZERO_FRACTION'))
{
    define('JSON_PRESERVE_ZERO_FRACTION', 1024);
}