Plesk 12.x / Linux :: Allow PHP5 Json Decode Function In Chrooted Environment

I'm Running Plesk 12 latest version. I've been partially followed that instructions to add php5 to a chrooted environment with success : [URL] .....

Code:
bash-4.3$ php --version
PHP 5.5.9-1ubuntu4.5 (cli) (built: Oct 29 2014 11:59:10)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies

This is how i did it, as root user :

Code:
./chroot_update.sh --add /usr/lib/php5
mkdir /var/www/vhosts/chroot/usr/share
cp -a /usr/share/zoneinfo /var/www/vhosts/chroot/usr/share
php -i | grep extension_dir
# returns : /usr/lib/php5/20121212/

[Code] .....