PHP

Install mcrypt on Ubuntu 18.04

$ sudo apt -y install gcc make autoconf libc-dev pkg-config libmcrypt-dev php7.2-dev
$ sudo pecl install --nodeps mcrypt-snapshot

$ echo "extension=mcrypt.so" | sudo tee -a /etc/php/7.2/fpm/php.ini
$ php-fpm7.2 -i | grep mc
Registered Stream Filters => zlib.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk, mcrypt.*, mdecrypt.*, bzip2.*, convert.iconv.*
mcrypt
mcrypt support => enabled
mcrypt_filter support => enabled
mcrypt.algorithms_dir => no value => no value
mcrypt.modes_dir => no value => no value