Outputs a large amount of information about the current state of PHP. This includes information about PHP compilation options and extensions, the PHP version, server information and environment (if compiled as a module), the PHP environment, OS version information, paths, master and local values of configuration options, HTTP headers, and the PHP License.

Because every system is setup differently, phpinfo() is commonly used to check configuration settings and for available predefined variables on a given system.

Because phpinfo can contain such sensitive data about your host or server. I scripted a really quick version that is only viewable by logged in admins. It takes about 30 seconds to install and you don't have to delete it afterwords in fear of a security risk.

It is a great mod to always have handy!!