check php version
$ php -version
Install mcrypt extension
$ sudo apt-get -y install gcc make autoconf libc-dev pkg-config
$ sudo apt-get -y install libmcrypt-dev
if php version > 7.3.0
$ sudo pecl install mcrypt-1.0.2
if php version <= 7.3.0
$ sudo pecl install mcrypt-1.0.1
When you are shown the prompt (Press [Enter] to autodetect)
> libmcrypt prefix? [autodetect] :
enable 'mcrypt' in php.ini -> check if 'mcrypt' is already in php.ini and maybe just needs to be uncommented
$ more /opt/bitnami/php/etc/php.ini | grep mcrypt
;extension=mcrypt.so
add or uncomment 'extension=mcrypt.so' in php.ini
$ emacs /opt/bitnami/php/etc/php.ini
REFERENCES...
