set_status_header([$code = 200[, $text = '']])

cache($time)

get_output()

set_content_type($mime_type[, $charset = NULL])

class CI_Output $parse_exec_vars = TRUE; Enables/disables parsing of the

_display([$output = ''])

set_header($header[, $replace = TRUE])

set_output($output)

get_content_type()

enable_profiler([$val = TRUE])