Select the Site menu option in Joomla 2.5 back-end. Then down to System Information. Here we can view server, PHP and Joomla version information. Let’s select the PHP Settings menu tab. Here we can view PHP settings relevant to Joomla 2.5 and their values like Safe Mode, Magic Quotes, etc..
Select the Configuration File menu tab. The contents of your configuration.inc.php file are displayed here. Many of these items can be changed under Global Configuration if your configuration file is writable. Now select the Directory Permissions menu tab.
All listed directories should be writable for normal Joomla operations. This listing is informational only. Next select the PHP Information menu tab. Here we can view all of the PHP Information and how it is currently configured on your host server. This is the same information as displayed by the PHP code . You now know how to view System Information in Joomla 2.5