A/B Testing is a great way for finding the better performing version of text, layouts, images, colors or any other element. in a website.

phpA/B is a free PHP script that enables you to setup A/B tests on your website so quickly.

It integrates automatically into your Google Analytics, allowing deeper insight into your tests’ impact on users.

phpA/B

The script can be run in trial mode to find out if the variations are working completely and, if it is, can be switched to live mode.

phpA/B also automatically filters search engine bots out of your tests to keep the data clean.

P.S. More on A/B Testing on Wikipedia.

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