user@server:$ sudo apt-get install php5-json Reading package lists... Done Building dependency tree Reading state information... Done php5-json is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 30 not upgraded.
user@server:$ sudo php -m [PHP Modules] ... iconv json libxml ...
if you have just installed, try rebooting the web server.
sudo service apache2 reload or
sudo service apache2 restart
and check in etc/php5...conf.d, prilinkovan expansion
recently ran a similar question, browse. dare seems to be installing a separate package (in Ubuntu is)
As wrote above, you need links posozdavat, shared folder /etc/php5/conf.d/ stopped picked up. Even for apache sites have stopped picked up if the config doesn't end .conf