微信开发中有个问题,$this->logger("R ".$postStr);

<code>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;
        }
    }</code>

<code>private function logger($log_content)
    {
    }</code>

<code>//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);
    }</code>

<code>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;
        }
    }</code>

<code>private function logger($log_content)
    {
    }</code>

<code>//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);
    }</code>