To install Mcrypt PHP extension you can generally make use of the pecl command.
On macOS Big Sur you can run the following command and it will automatically install the Mcrypt PHP Extension.
For macOS
On macOS Big Sur you can run the following command and it will automatically install the Mcrypt PHP Extension.
pecl install mcrypt
Once it's installed you should add "extension=mcrypt.so" to php.ini and restart PHP.
For Ubuntu
For Ubuntu, that's running PHP version 8 you can run the command below.
sudo apt install php8.0-mcrypt sudo phpenmod mcrypt
