<?php
namespace Log4Me;
#´´½¨ÈÕÆÚ£º2012-4-13 ÏÂÎç4:10:48
#×÷Õß£ºxcc
#ÅäÖÃÎÄ¼þ¶ÁÈ¡Æ÷
#date_default_timezone_set('PRC');

const LOG_LEVEL_DEBUG = 0;   
const LOG_LEVEL_INFO = 1;
const LOG_LEVEL_WARN = 2;
const LOG_LEVEL_ERROR = 3;
const LOG_LEVEL_FATAL = 4;


const WRITE_MODE_PERDAY = 0;  //°´ÌìÐ´ÈÕÖ¾
const WRITE_MODE_PERHOUR = 1; //°´Ð¡Ê±Ð´ÈÕÖ¾

const DEF_LOG_LEVEL = LOG_LEVEL_INFO;    //Ä¬ÈÏDebugµÈ¼¶
const DEF_WRITE_MODE = WRITE_MODE_PERDAY; //Ä¬ÈÏ°´ÌìÐ´ÈÕÖ¾

$LOG_LEVEL_STR_ARRAY = array('Debug', 'Info', 'Warn', 'Error', 'Fatal');

class Log4Me
{
	private $m_sDir;
	private $m_sFileName;
	private $m_LOG_LEVEL;
	private $m_WRITE_MODE;
	private $m_sFullLogPath;  //ÍêÕûÈÕÖ¾Â·¾¶
	private $m_sAffixStr;
	function __construct($dir, $fileName, $logLev = DEF_LOG_LEVEL, $writeMode = DEF_WRITE_MODE)
	{
		$this->m_sDir = $dir;          
		$this->m_sFileName = $fileName;
		$this->m_LOG_LEVEL = $logLev;
		$this->m_WRITE_MODE = $writeMode;
		$this->m_sFullLogPath = '';
	}
	
	private function _check_and_create_new_log_file()
	{
		$bCreate = false;
		$curLogPath = '';
		if ($this->m_WRITE_MODE === WRITE_MODE_PERDAY)
		{
			$curLogPath = sprintf("%s\\%s_%s.log", $this->m_sDir, $this->m_sFileName, date("Ymd"));
		}
		else {
			//Èç¹ûÎª¿Õ£¬¾Í´´½¨ÈÕÖ¾
			$curLogPath = sprintf("%s\\%s\\%s_%s.log", $this->m_sDir, date("Ymd"), $this->m_sFileName, date("H"));
		}
					
		//Èç¹ûÎª¿Õ£¬¾Í´´½¨ÈÕÖ¾
		if ($this->m_sFullLogPath === '')
		{
			$bCreate = true;
		}
		else 
		{
			//ÈÕÆÚ¸Ä±äÁË£¬ÐèÒª´´½¨ÐÂÈÕÖ¾
			if ($curLogPath != $this->m_sFullLogPath)
			{
				$bCreate = true;
			}
		}
		
		if ($bCreate)
		{	
			//²»´æÔÚÎÄ¼þ¼Ð£¬´´½¨
			file_exists($dir = dirname($curLogPath)) || mkdir($dir, 0777, true);
			$this->m_sFullLogPath = $curLogPath;
		}
	}
	
	private function _log($info, $level)
	{
		global $LOG_LEVEL_STR_ARRAY;
		//µÈ¼¶µÍÓÚµ±Ç°ÉèÖÃµÄÈÕÖ¾µÈ¼¶£¬²»Ð´ÈÕÖ¾
		if ($level < $this->m_LOG_LEVEL)
		{
			return;
		}
		
		//¼ì²éÊÇ·ñÐèÒªÖØÐÂ´´½¨ÈÕÖ¾ÎÄ¼þ£¬Èç¹ûÐèÒª¾Í´´½¨
		$this->_check_and_create_new_log_file();
		//Ð´ÈÕÖ¾
		if (empty($this->m_sAffixStr))
		{
			$info = sprintf("%s\t%s\t%s\r\n", date("Y-m-dTH:i:s"), $LOG_LEVEL_STR_ARRAY[$level], $info);
		}
		else
		{
			$info = sprintf("%s\t%s\t%s\t%s\r\n", date("Y-m-dTH:i:s"), $LOG_LEVEL_STR_ARRAY[$level], 
							$this->m_sAffixStr, $info);
		}
		file_put_contents($this->m_sFullLogPath, $info, FILE_APPEND);
	}
	
	//ÉèÖÃ¸½¼Ó×Ö·û´®
	public function SetAffixStr($affix)
	{
		$this->m_sAffixStr = $affix;
	}
	//»ñÈ¡¸½¼Ó×Ö·û´®
	public function GetAffixStr()
	{
		return $this->m_sAffixStr;
	}
	
	public function Debug($info)
	{
		$this->_log($info, LOG_LEVEL_DEBUG);
	}
	
	public function Info($info)
	{
		$this->_log($info, LOG_LEVEL_INFO);
	}
	
	public function Warn($info)
	{
		$this->_log($info, LOG_LEVEL_WARN);
	}
	
	public function Error($info)
	{
		$this->_log($info, LOG_LEVEL_ERROR);
	}
	
	public function Fatal($info)
	{
		$this->_log($info, LOG_LEVEL_FATAL);
	}
}

?>