mb_strpos() returns the numeric position of
the first occurrence of needle in the
haystack string. If
needle is not found, it returns
mb_strpos() performs multi-byte safe strpos() operation based on number of characters. needle position is counted from the beginning of the haystack. First character's position is 0. Second character position is 1, and so on.
If encoding is omitted, internal character encoding is used.
offset is search offset. If it is not specified, 0 is used.
encoding is character encoding name. If it is omitted, internal character encoding is used.