How can one troubleshoot the "no PHP dll" error when trying to use mcrypt in PHP?

To troubleshoot the "no PHP dll" error when trying to use mcrypt in PHP, you can enable the mcrypt extension in your PHP configuration file. This error typically occurs when the mcrypt extension is not enabled or properly configured in PHP. You can enable the extension by uncommenting the line extension=php_mcrypt.dll in your php.ini file and then restart your web server.

// Enable mcrypt extension in php.ini
extension=php_mcrypt.dll