问PHP错误:消息:无法修改标头信息-标头已由发送(输出开始于

EN

        // For safety reasons we do not show the full file path
        if (FALSE !== strpos($filepath, '/'))
        {
            $x = explode('/', $filepath);
            $filepath = $x[count($x)-2].'/'.end($x);
        }

        if (ob_get_level() > $this->ob_level + 1)
        {
            ob_end_flush();
        }
        ob_start();
        include(APPPATH.'errors/error_php.php');
        $buffer = ob_get_contents();
        ob_end_clean();
        echo $buffer;
    }


}
// END Exceptions Class

    function set_status_header($code = 200, $text = '')
    {
        $stati = array(
                            200 => 'OK',
                            201 => 'Created',
                            202 => 'Accepted',
                            203 => 'Non-Authoritative Information',
                            204 => 'No Content',
                            205 => 'Reset Content',
                            206 => 'Partial Content',

                            300 => 'Multiple Choices',
                            301 => 'Moved Permanently',
                            302 => 'Found',
                            304 => 'Not Modified',
                            305 => 'Use Proxy',
                            307 => 'Temporary Redirect',

                            400 => 'Bad Request',
                            401 => 'Unauthorized',
                            403 => 'Forbidden',
                            404 => 'Not Found',
                            405 => 'Method Not Allowed',
                            406 => 'Not Acceptable',
                            407 => 'Proxy Authentication Required',
                            408 => 'Request Timeout',
                            409 => 'Conflict',
                            410 => 'Gone',
                            411 => 'Length Required',
                            412 => 'Precondition Failed',
                            413 => 'Request Entity Too Large',
                            414 => 'Request-URI Too Long',
                            415 => 'Unsupported Media Type',
                            416 => 'Requested Range Not Satisfiable',
                            417 => 'Expectation Failed',

                            500 => 'Internal Server Error',
                            501 => 'Not Implemented',
                            502 => 'Bad Gateway',
                            503 => 'Service Unavailable',
                            504 => 'Gateway Timeout',
                            505 => 'HTTP Version Not Supported'
                        );

        if ($code == '' OR ! is_numeric($code))
        {
            show_error('Status codes must be numeric', 500);
        }

        if (isset($stati[$code]) AND $text == '')
        {
            $text = $stati[$code];
        }

        if ($text == '')
        {
            show_error('No status text available.  Please check your status code number or supply your own message text.', 500);
        }

        $server_protocol = (isset($_SERVER['SERVER_PROTOCOL'])) ? $_SERVER['SERVER_PROTOCOL'] : FALSE;

        if (substr(php_sapi_name(), 0, 3) == 'cgi')
        {
            header("Status: {$code} {$text}", TRUE);
        }
        elseif ($server_protocol == 'HTTP/1.1' OR $server_protocol == 'HTTP/1.0')
        {
            header($server_protocol." {$code} {$text}", TRUE, $code);
        }
        else
        {
            header("HTTP/1.1 {$code} {$text}", TRUE, $code);
        }
    }
}