How can one effectively downgrade PHP versions from 4.4.x to 4.0.x?

To effectively downgrade PHP versions from 4.4.x to 4.0.x, you will need to uninstall the current version of PHP and then install the desired version. This process may vary depending on your operating system and package manager. It is recommended to consult the official PHP documentation or seek assistance from a professional to ensure a smooth downgrade process. ```bash # Uninstall current PHP version sudo apt-get purge php4 # Install PHP 4.0.x sudo apt-get install php4=4.0.x ```