/** * 日志处理类 *  * @since alpha 0.0.1 * @date 2014.03.04 * @author genialx *  */  class Log{  //单例模式  private static $instance    = NULL;  //文件句柄  private static $handle      = NULL;  //日志开关  private $log_switch     = NULL;  //日志相对目录  private $log_file_path      = NULL;  //日志文件最大长度，超出长度重新建立文件  private $log_max_len        = NULL;  //日志文件前缀,入 log_0  private $log_file_pre       = 'log_';  /** * 构造函数 *  * @since alpha 0.0.1 * @date 2014.02.04 * @author genialx */  protected function __construct(){//注意：以下是配置文件中的常量，请读者自行更改  $this->log_file_path     = LOG_FILE_PATH;  $this->log_switch     = LOG_SWITCH;    $this->log_max_len    = LOG_MAX_LEN;  }  /** * 单利模式 *  * @since alpha 0.0.1 * @date 2014.02.04 * @author genialx */  public static function get_instance(){  if(!self::$instance instanceof self){  self::$instance = new self;  }  return self::$instance;  }  /** *  * 日志记录 *  * @param int $type  0 -> 记录(THING LOG) / 1 -> 错误(ERROR LOG) * @param string $desc * @param string $time *  * @since alpha 0.0.1 * @date 2014.02.04 * @author genialx *  */  public function log($type,$desc,$time){  if($this->log_switch){  if(self::$handle == NULL){  $filename = $this->log_file_pre . $this->get_max_log_file_suf();  self::$handle = fopen($this->log_file_path . $filename, 'a');  }  switch($type){  case 0:  fwrite(self::$handle, 'THING LOG:' . ' ' . $desc . ' ' . $time . chr(13));  break;  case 1:  fwrite(self::$handle, 'ERROR LOG:' . ' ' . $desc . ' ' . $time . chr(13));  break;  default:  fwrite(self::$handle, 'THING LOG:' . ' ' . $desc . ' ' . $time . chr(13));  break;  }  }  }  /** * 获取当前日志的最新文档的后缀 *  * @since alpha 0.0.1 * @date 2014.02.04 * @author genialx */  private function get_max_log_file_suf(){  $log_file_suf = null;  if(is_dir($this->log_file_path)){  if($dh = opendir($this->log_file_path)){  while(($file = readdir($dh)) != FALSE){  if($file != '.' && $file != '..'){  if(filetype( $this->log_file_path . $file) == 'file'){  $rs = split('_', $file);  if($log_file_suf < $rs[1]){  $log_file_suf = $rs[1];  }  }  }  }  if($log_file_suf == NULL){  $log_file_suf = 0;  }  //截断文件  if( file_exists($this->log_file_path . $this->log_file_pre . $log_file_suf) && filesize($this->log_file_path . $this->log_file_pre . $log_file_suf) >= $this->log_max_len){  $log_file_suf = intval($log_file_suf) + 1;  }  return $log_file_suf;  }     }  return 0;  }  /** * 关闭文件句柄 *  * @since alpha 0.0.1 * @date 2014.02.04 * @author genialx */  public function close(){  fclose(self::$handle);  }
}