Description:
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From manual page: http://www.php.net/function.stripos#Return Values
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The return values section of the documentation does not specify the return value 
of the stripos() function in the event that the $needle is found in the $haystack.  
It only specifies the return value if the $needle is NOT found.

While this may be fairly obvious, the documentation should still be updated to 
reflect this information.