本文实例讲述了PHP日志LOG类定义与用法。分享给大家供大家参考，具体如下：
<?php
/**
class Config{
public static function getConfig (){
return array(
'LOG_FILE'=>'test.txt',
'LOG_LEVEL'=>75 //INFO
);
}
}
class Log{
private $LogFile;
private $logLevel;
const DEBUG = 100;
const INFO = 75;
const NOTICE = 50;
const WARNING =25;
const ERROR = 10;
const CRITICAL = 5;
private function __construct(){
$cfg = Config::getConfig();
$this->logLevel = isset(/**【技术点，其实还需要更多地实践】**/$cfg['LOG_LEVEL']) ? $cfg['LOG_LEVEL']:LOG::INFO;
if(!isset($cfg['LOG_FILE']) && strlen($cfg['LOG_FILE'])){
throw new Exception('can't set file to empty');
}
$this->LogFile = @fopen($cfg['LOG_FILE'],'a ');
if(!is_resource($this->LogFile)){
throw new Exception('invalid file Stream');
}
}
public static function getInstance(){
static $obj;
if(!isset($obj)){
$obj = new Log();
}
return $obj;
}
public function LogMessage($msg, $logLevel = Log::INFO,$module = null){
if($logLevel > $this->logLevel){
return ;
}
date_default_timezone_set('Asia/shanghai');
$time = strftime('%x %X',time());
$msg = str_replace("t",'',$msg);
$msg = str_rep/**【尽量使用一键安装脚本，要么自己做，要么网上下载或使用我博客的，把时间用在更多的地方，少做重复劳动的事情】**/lace("n",'',$msg);
$strLogLevel = $this->levelToString($logLevel);
if(isset($module)){
$module = str_replace(array("n","t"),array("",""),$module);
}
$logLine = "$timet$msgt$strLogLevelt$modulern";
fwrite($this->LogFile,$logLine);
}
public function levelToString($logLevel){
$ret = '[unknow]';
switch ($logLevel){
case LOG::DEBUG:
$ret = 'LOG::DEBUG';
break;
case LOG::INFO:
$ret = 'LOG::INFO';
break;
case LOG::NOTICE:
$ret = 'LOG::NOTICE';
break;
case LOG::WARNING:
$ret = 'LOG::WARNING';
break;
case LOG::ERROR:
$ret = 'LOG::ERROR';
break;
case LOG::CRITICAL:
$ret = 'LOG::CRITICAL';
break;
}
return $ret;
}
}
$logIns = LOG::getInstance();
//print_r($logIns);
$logIns->logMessage("test",LOG::INFO,'myTest');
?>
运行程序，在当前目录下生成test.txt文件内容如下（这里是运行3次的结果）：
09/06/18 14:56:20 test LOG::INFO myTest
09/06/18 14:56:21 test LOG::INFO myTest
09/06/18 14:56:22 test LOG::INFO myTest
希望本文所述对大家PHP程序设计有所帮助。
