分享一个用了很久的php日志类

<?php
class 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;
}
?>

function createDir($dir){
return is_dir($dir) or ($this->createDir(dirname($dir)) and @mkdir($dir, 0777));
}

require("../log.class.php");
$log_path = DEBUG_LOG_PATH.'account_check/';
$log_file_name = 'debug.log';
$log_obj = new Logs($log_path, $log_file_name);
$log_obj->setLog("param is:userid:{$userip}, account:{$account},pwd:{$pwd}, rid:{$rid}");