PHP. Руководство по PHP. 2005
mb_http_output
mb_http_output
Description
mixed mb_http_output ([string encoding])If encoding is set, mb_http_output() sets HTTP output character encoding to encoding. Output after this function is converted to encoding. mb_http_output() returns TRUE for success and FALSE for failure.
If encoding is omitted, mb_http_output() returns current HTTP output character encoding.
See also mb_internal_encoding(), mb_http_input(), mb_detect_order().
mb_http_input
mb_internal_encoding