PHP日志LOG类定义与用法示例

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
/**
* PHP log 类
*/
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();  
   $this->logLevel = isset($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);
   $msg = str_replace("\n",'',$msg);
   $strLogLevel = $this->levelToString($logLevel);
   if(isset($module)){
     $module = str_replace(array("\n","\t"),array("",""),$module);
   }
   $logLine = "$time\t$msg\t$strLogLevel\t$module\r\n";
   fwrite($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。

来源：https://blog.csdn.net/luyaran/article/details/53214627