(PHP 5 >= 5.2.0, PHP 7)
Finds position of first occurrence of a string within another, case insensitive
int mb_stripos ( string $haystack, string $needle [, int $offset = 0 [, string $encoding = mb_internal_encoding() ]] )
mb_stripos() returns the numeric position of the first occurrence of needle in the haystack string. Unlike mb_strpos(), mb_stripos() is case-insensitive. If needle is not found, it returns FALSE.