This solved it for me on my Linux Mint local enviroment https://askubuntu.com/questions/350942/cannot-get-mcrypt-for-php5
I needed to make a symlink to my /etc/php5/conf.d/mcrypt.ini file in the following folders /etc/php5/apache2/conf.d/mcrypt.ini and /etc/php5/cli/conf.d/mcrypt.ini