mb_strripos() performs multi-byte safe strripos() operation based on number of characters. needle position is counted from the beginning of haystack. First character's position is 0. Second character position is 1. Unlike mb_strrpos(), mb_strripos() is case-insensitive.
The string from which to get the position of the last occurrence of needle
The string to find in haystack
The position in haystack to start searching
Character encoding name to use. If it is omitted, internal character encoding is used.
Return the numeric position of
the last occurrence of needle in the
haystack string, or
if needle is not found.