int strripos ( string $haystack , string $needle [, int $offset = 0 ] )
Find position of last occurrence of a string in a string. Unlike strrpos(), strripos() is case-insensitive.
Returns the numerical position of the last occurrence of needle. Also note that string positions start at 0, and not 1. If needle is not found, FALSE is returned. Warning: This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE, such as 0 or "". Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.