mb_http_input() returns result of HTTP input character encoding detection.
type: Input string specifies input
type. "G" for GET, "P" for POST,
"C" for COOKIE, "S" for string, "L" for list, "I" for whole
list (will return array). If type is omitted, it returns last
input type processed.
Return Value: Character encoding name. If mb_http_input() does not process specified HTTP input, it returns FALSE.
See also mb_internal_encoding(), mb_http_output(), mb_detect_order().