Error Received Unknown Function Split

I recently got this error showing up at the top of my web site. I have made no changes to it so wondered why it is giving it and what it means.

Unknown: Function split() is deprecated in /home/yousuf/public_html/crystalsiliconewatches/catalog/view/theme/OC04A00402/az_template/mapping/browser_agent.php on line 28

As of php 5.3.0 the split() function has been deprecated, meaning there are better ways of achieving the same result.

Try replacing 'split' with 'explode' in the file mentioned

That worked!

Thanks for the help