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It appears that on PHP 7.2 Mcrypt has been removed.
It looks like CI 3 has two options, mcrypt and openssl. This is done through codeigniter > libraries > Encryption.php
but I believe Fuel CMS is using the deprecated Encrypt.php class , see https://www.codeigniter.com/user_guide/libraries/encrypt.html
Is is possible to set Fuel CMS to use the newer encryption library and take advantage of the openssl encryption option when mcrypt is not available?