php is not working well on ubuntu 13.10 and mcrypt is missing(solution)

First install it…

sudo apt-get install php5-mcrypt

Now move it to php modules directory & enable the module

mv -i /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available/
sudo php5enmod mcrypt

Now restart the server

for Apache:

sudo service apache2 restart

for nginx:

sudo service nginx restart