(PHP 3>= 3.0.6, PHP 4 , PHP 5)stristr -- Case-insensitive strstr()
Returns all of haystack from the first occurrence of needle to the end. needle and haystack are examined in a case-insensitive manner.
If needle is not found, returns FALSE.
If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.