PHPinfo is a function that returns information, in HTML form, about the PHP environment on your server (see http://us2.php.net/phpinfo
for more information).
To run PHPinfo you must save the following code in a file on your computer using your text editor:
FTP the file to the web content folder for your domain.
If your file is named "phpinfo.php", then you will run PHPinfo by using your web browser to go to "www.yourdomain.com/phpinfo.php"