Use of undefined constant MCRYPT_BLOWFISH

Question

After reinstalling our server, MCRYPT is no longer working and PHP gives the notice

Use of undefined constant MCRYPT_BLOWFISH (Apache 2.4, PHP 5.5).

php -m returns mcrypt.

ls -al /etc/php5/apache2/conf.d/
20-mcrypt.ini -> ../../mods-available/mcrypt.ini

cat /etc/php5/mods-available/mcrypt.ini
; configuration for php MCrypt module
extension=mcrypt.so

Why is mcrypt not recognized? How can I make this work?

See: http://www.madcapsule.com/blog/php-mcrypt-magento-error — GolezTrol, Jul 07 '14 at 10:43
Thanks, but unfortunately I had already tried that. I have libmcrypt4 installed. — Ben Rogmans, Jul 07 '14 at 11:25
I've come across the exact error. And that site doesn't work. From what I can tell, the MCRYPT constants don't exist :/ — phazei, Jul 09 '14 at 04:39

score 23 · Accepted Answer · edited May 23 '17 at 12:25

23

No sooner do I speak do I find a solution, heh.

This worked for me: mCrypt not present after Ubuntu upgrade to 13.10

needed to go: sudo php5enmod mcrypt

even though it appeared to already be enabled, that fixed it.

edited May 23 '17 at 12:25

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answered Jul 09 '14 at 04:44

phazei

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"sudo php5enmod mcrypt" did the trick! For other readers: restart apache after this with the command "sudo service apache2 restart" – Ben Rogmans Jul 09 '14 at 06:15
this worked for my laravel/homestead vagrant box https://gist.github.com/Artistan/ee25f22f5e931b7ee46f3d6167d87e5f – Artistan Jul 09 '18 at 16:07

score 4 · Answer 2 · edited Mar 13 '20 at 09:36

When I try to enable the Express Paypal method, I came across this error.

Error: Use of undefined constant MCRYPT_BLOWFISH - assumed MCRYPT_BLOWFISH in /var/www/.../lib/Varien/Crypt/Mcrypt.php on line 56

Firstly, we can run this cmd to check the mcrypt is running or not:

php --ri mcrypt

If mcrypt is not enabled, we can use the following to enable it as others mentioned

sudo php5enmod mcrypt

As well, we had better check php5-mcrypt package is installed or not

dpkg -l | grep php5-mcrypt

While if you install fastcgi and php-fpm like us, we have to restart the php-fpm service, and apache2 service as well.

sudo service apache2 restart
sudo service php-fpm restart

Use of undefined constant MCRYPT_BLOWFISH

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