Yahoo! supports PHP 4 and PHP 5. We recommend that you run the latest version of PHP available. Although we have reinforced our system to ensure PHP 4 runs safely, PHP 5 is generally considered more secure and best supports modern applications and scripts.

To use MySQL 5, you'll need to be running PHP version 5.3.6 or higher which allows you to use the most up-to-date and secure add-ons as well as advanced scripting not available to earlier versions of PHP. Please be sure to upgrade PHP to 5.3.6 or higher before you begin upgrading your database.

For the most up-to-date information on the current state of PHP, including version and environment information, use the phpinfo() function.

Insert the following function into a PHP file:

<?php

phpinfo();

?>

You can also identify which version of PHP you are currently running by visiting the Create & Update tab and opening the Other Site Building Tools module. Under PHP Version, you'll see your current PHP version.