<?phpclass Logs{    private $FilePath;    private $FileName;    private $m_MaxLogFileNum;    private $m_RotaType;    private $m_RotaParam;    private $m_InitOk;    private $m_Priority;    private $m_LogCount;    /**     * @abstract 初始化     * @param String $dir 文件路径     * @param String $filename 文件名     * @return      */    function Logs($dir, $filename, $priority = Logs::INFO, $maxlogfilenum = 3, $rotatype = 1, $rotaparam = 5000000)    {        $dot_offset = strpos($filename, ".");        if ($dot_offset !== false)            $this->FileName = substr($filename,0, $dot_offset);        else            $this->FileName = $filename;        $this->FilePath = $dir;        $this->m_MaxLogFileNum = intval($maxlogfilenum);        $this->m_RotaParam = intval($rotaparam);        $this->m_RotaType = intval($rotatype);        $this->m_Priority = intval($priority);        $this->m_LogCount = 0;        $this->m_InitOk = $this->InitDir();        umask(0000);         $path=$this->createPath($this->FilePath,$this->FileName);        if(!$this->isExist($path))        {            if(!$this->createDir($this->FilePath))            {                #echo("创建目录失败!");            }            if(!$this->createLogFile($path)){                #echo("创建文件失败!");            }        }    }    private function InitDir()    {        if (is_dir($this->FilePath) === false)        {            if(!$this->createDir($this->FilePath))            {                //echo("创建目录失败!");                //throw exception                return false;            }        }        return true;    }    /**     * @abstract 写入日志     * @param String $log 内容     */        function setLog($log)    {        $this->Log(Logs::NOTICE, $log);    }    function LogDebug($log)    {        $this->Log(Logs::DEBUG, $log);    }    function LogError($log)    {        $this->Log(Logs::ERROR, $log);    }    function LogNotice($log)    {        $this->Log(Logs::NOTICE, $log);    }    function Log($priority, $log)    {        if ($this->m_InitOk == false)            return;        if ($priority > $this->m_Priority)            return;        $path = $this->getLogFilePath($this->FilePath, $this->FileName).".log";        $handle=@fopen($path,"a+");        if ($handle === false)        {            return;        }        $datestr = strftime("%Y-%m-%d %H:%M:%S ");        $caller_info = $this->get_caller_info();        //var_dump($caller_info);        if(!@fwrite($handle, $caller_info.$datestr.$log."/n")){//写日志失败            //echo("写入日志失败");        }        @fclose($handle);        $this->RotaLog();    }    private function get_caller_info()    {    	$ret = debug_backtrace();    	foreach ($ret as $item)    	{    		if(isset($item['class']) && 'Logs' == $item['class'])    		{    			continue;    		}    		$file_name = basename($item['file']);    		return <<<S{$file_name}:{$item['line']}  S;    	}    }    private function RotaLog()    {        $file_path = $this->getLogFilePath($this->FilePath, $this->FileName).".log";        if ($this->m_LogCount%10==0)            clearstatcache();        ++$this->m_LogCount;        $file_stat_info = stat($file_path);        if ($file_stat_info === FALSE)            return;        if ($this->m_RotaType != 1)            return;             //echo "file: ".$file_path." vs ".$this->m_RotaParam."/n";        if ($file_stat_info['size'] < $this->m_RotaParam)            return;        $raw_file_path = $this->getLogFilePath($this->FilePath, $this->FileName);        $file_path = $raw_file_path.($this->m_MaxLogFileNum - 1).".log";        //echo "lastest file:".$file_path."/n";        if ($this->isExist($file_path))        {            unlink($file_path);        }        for ($i = $this->m_MaxLogFileNum - 2; $i >= 0; $i--)        {            if ($i == 0)                $file_path = $raw_file_path.".log";            else                $file_path = $raw_file_path.$i.".log";            if ($this->isExist($file_path))            {                $new_file_path = $raw_file_path.($i+1).".log";                if (rename($file_path, $new_file_path) < 0)                {                    continue;                }            }        }    }    function isExist($path){        return file_exists($path);    }    /**     * @abstract 创建目录     * @param <type> $dir 目录名     * @return bool     */    function createDir($dir){        return is_dir($dir) or ($this->createDir(dirname($dir)) and @mkdir($dir, 0777));    }    /**     * @abstract 创建日志文件     * @param String $path     * @return bool     */    function createLogFile($path){        $handle=@fopen($path,"w"); //创建文件        @fclose($handle);        return $this->isExist($path);    }    /**     * @abstract 创建路径     * @param String $dir 目录名     * @param String $filename      */    function getLogFilePath($dir,$filename){        return $dir."/".$filename;    }    const EMERG  = 0;    const FATAL  = 0;    const ALERT  = 100;    const CRIT   = 200;    const ERROR  = 300;    const WARN   = 400;    const NOTICE = 500;    const INFO   = 600;    const DEBUG  = 700;}?>使用方法：