If you find that after upgrading you computer to a
distribution that ships PHP 5.5, be aware that you
will need to install the json library and enable it

`sudo apt-get install php5-json`
`sudo php5enmod json`

Bear in mind that this is ubuntu, I have not tried with
other distributions so I am not sure how this works on those.

Thanks to iteration99 for the heads up

Tags: php, json