Since PHP/CURL is tightly integrated with PHP, installation should be unnecessary, or at worst, easy. You probably already have PHP/CURL on your computer; you just need to enable it in php.ini, the PHP configuration file. If you're using Linux, FreeBSD, OS X, or another Unix-based operating system, you may have to recompile your copy of Apache/PHP to enjoy the benefits of PHP/CURL. Installing PHP/CURL is similar to installing any other PHP library. If you need help, you should reference the PHP website (http://www.php.net) for the instructions for your particular operating system and PHP version.