strstr() and stristr both are used to find the first occurence of the string.
stristr( ) is case insensitive and strstr( ) is case sensitive.
string strstr ( string $haystack , mixed $needle [, bool $before_needle = false ] ) haystack The input string. needle If needle is not a string, it is converted to an integer and applied as the ordinal value of a character. before_needle If TRUE, strstr() returns the part of the haystack before the first occurrence of the needle (excluding the needle). By default it is FALSE.
strstr() – Find first occurrence of a string Continue reading