mb_get_info() returns internal setting parameter of mbstring.
If type isn't specified or is specified to
"all", an array having the elements "internal_encoding",
"http_output", "http_input", "func_overload", "mail_charset",
"mail_header_encoding", "mail_body_encoding" will be returned. The last
three elements are available since PHP 5.1.3.
If type is specified for "http_output",
"http_input", "internal_encoding", "func_overload",
the specified setting parameter will be returned.
See also mb_internal_encoding(), mb_http_output().