PHP Browser Detection is a WordPress plugin used to detect a user’s browser. It could be used to send conditional CSS files for Internet Explorer, display different content or custom messages anywhere on the page, or to swap out flash for an image for iPhones.
Features:
Get all browser information returned in an array.
Conditional statements to detect each version of Internet Explorer.
Conditional statements to detect if it is any mobile browser.
Conditional statements to detect if it is an iPhone.
Plugin Homepage: http://martythornley.com/downloads/php-browser-detection/