You need to compile PHP with the --with-mcrypt[=DIR] parameter to enable this extension. DIR is the mcrypt install directory. Make sure you compile libmcrypt with the option --disable-posix-threads .

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User Contributed Notes 6 notes

3 years ago
Note, for Ubuntu, simply installing php5-mcrypt did not get mcrypt to work. You need to execute the following commands as root to enable it:

apt-get install php5-mcrypt
mv -i /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available/
php5enmod mcrypt
service apache2 restart
3 years ago
If you don't have a /etc/php5/conf.d directory, you can simply only do: php5enmod mcrypt

Should be working fine.
Tanner Williamson
3 years ago
On Ubuntu 14.04 LTS using php5-fpm with Nginx, I had to symlink the mcrypt.ini to the correct location, and then restart php5-fpm and nginx.
#ln -s /etc/php5/mods-available/mcrypt.ini /etc/php5/fpm/conf.d/mcrypt.ini
#service php5-fpm restart
#service nginx restart
biz at svstartuplab dot com
3 years ago
I needed to install mcrypt on Mac OS X Mavericks 10.9 for installing the Laravel 5 framework. I entered in the Terminal command line:

brew tap josegonzalez/homebrew-php
brew install php54 php54-mcrypt

This installed Mcrypt.  In Terminal type php -i to see a list of everything installed or for much better formatting and easier to read make a phpinfo.php page with this inside <?php phpinfo(); ?> 

More help with installing on OS X:
james dot mclean at gmail dot com
8 years ago
You can install Mcrypt from the PHP Source Tree as a module if you choose.

You first need to ensure you have libmcrypt, libmcrypt-devel, and mcrypt installed, then do:

# cd php-5.x.x/ext/mcrypt
# phpize
# aclocal
# ./configure
# make && make install

Enable the module by adding: '' to PHP.ini.


Very handy if you need to install a single module and you may have installed PHP via RPM, but don't wish to recompile your whole PHP install.
trenton at rainleader dot com
6 years ago
If using a Debian-based Linux system, you can run the following commands:

sudo apt-get install php5-mcrypt
sudo /etc/init.d/apache2 restart
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