There is a problem in the development of WeChat, $this->logger ("R". $postStr);

public function responseMsg()    {        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];//保留xml类型原始数据        if (!empty($postStr)){            $this->logger("R ".$postStr);                        $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);//把数据载入到对象postObj中            $RX_TYPE = trim($postObj->MsgType);//调用对象postObj里的MsgType            switch ($RX_TYPE)            {                case "event":                    $result = $this->receiveEvent($postObj);                    break;                case "text":                    $result = $this->receiveText($postObj);                    break;            }            $this->logger("T ".$result);            echo $result;        }    }

private function logger($log_content)    {    }

Code as above, the problem is
$this->logger ("R". $postStr);
$this->logger ("T". $result);
What do these two lines of code do?

//写日志，参数log_content传日志的内容    private function logger($log_content){        //日志大小 1000KB        echo "6";        $max_size = 1000;        $log_filename = "log.xml";                if(file_exists($log_filename) && (abs(filesize($log_filename)) > $max_size)){            unlink($log_filename);        }                file_put_contents($log_filename,date("H:i:s")." ".$log_content."\n",FILE_APPEND);    }

Baidu saw this ... This is a little bit, but my previous logger method is empty and useful?

Reply content:

public function responseMsg()    {        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];//保留xml类型原始数据        if (!empty($postStr)){            $this->logger("R ".$postStr);                        $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);//把数据载入到对象postObj中            $RX_TYPE = trim($postObj->MsgType);//调用对象postObj里的MsgType            switch ($RX_TYPE)            {                case "event":                    $result = $this->receiveEvent($postObj);                    break;                case "text":                    $result = $this->receiveText($postObj);                    break;            }            $this->logger("T ".$result);            echo $result;        }    }

private function logger($log_content)    {    }

Code as above, the problem is
$this->logger ("R". $postStr);
$this->logger ("T". $result);
What do these two lines of code do?

//写日志，参数log_content传日志的内容    private function logger($log_content){        //日志大小 1000KB        echo "6";        $max_size = 1000;        $log_filename = "log.xml";                if(file_exists($log_filename) && (abs(filesize($log_filename)) > $max_size)){            unlink($log_filename);        }                file_put_contents($log_filename,date("H:i:s")." ".$log_content."\n",FILE_APPEND);    }

Baidu saw this ... This is a little bit, but my previous logger method is empty and useful?

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