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PHP实现登陆后台限制到只允许一台机器在线

# <?php
# ob_start();
# session_start();
# class CC{
#   private $REFURL="http://edu.xvna.com";    //登陆成功后转换页面
#   private $LoginFLAG=false;        //登陆成功标志
#   private $loginFILE="loginmsg.txt";      //信息文件
#   function setFlag($flag){
#     $this->loginFLAG=$flag;
#   }
#   function check(){
#   global $_POST;
#     if(file_exists($this->loginFILE)&& (time()-filemtime($this->loginFILE))<60){//用户登陆存在而且有效
#       $info=file($this->loginFILE);
#       $username=trim($info[0]);  //已在线的登陆用户名
#       $password=trim($info[1]);  //已在线密码(可以不保存)
#       $ip   =trim($info[2]);  //已在线IP
#       $sid   =trim($info[3]);  //已在线PORT
#       if(strcmp($_SESSION[LoginUser],$username)==0){
#         if(strcmp($_SESSION['LoginPw'],$password)==0){
#           if(strcmp($_SERVER[REMOTE_ADDR],$ip)==0){
#             if(strcmp(session_id(),$sid)==0){
#               $this->setFlag(true);
#               echo "<h3>您的帐户可以确定是唯一的!</h3>";
#               $cf=fopen($this->loginFILE,"a+");
#               fputs($cf,"\r\na");
#               fclose($cf);
#               echo "<meta http-equiv=refresh content=\"10;url=t.php\">";
#               //echo "<iframe src=\"t.php\" frameborder=0 width=0 height=0></iframe>";
#             }else{
#               echo "不允许帐户在局网上同时登陆.. ".$_SERVER[REMOTE_PORT];
#               $this->LoginFLAG=false;
#             }       
#           }else{
#             echo "不允许使用帐户同时登陆..<br>";
#               $this->LoginFLAG=false;
#           }
#         }else{
#           echo "密码错误..<br>";
#           $this->LoginFLAG=false;
#         }
#       }else{
#       //这里验证身份如果正确则
#         echo "帐户登陆时发生错误!用户名错误<br><pre>";
#       }
#     }else{
#       if(isset($_POST[LoginUser])){
#         $_SESSION[LoginUser]=$_POST[LoginUser];
#         $_SESSION[LoginPw]=$_POST[LoginPw];
#         $fp=fopen($this->loginFILE,"w");
#         $msg=$_POST['LoginUser']."\r\n".$_POST['LoginPw']."\r\n".$_SERVER[REMOTE_ADDR]."\r\n".session_id();;
#         fputs($fp,$msg);
#         fclose($fp);
#       }else{
#         $outtime=time()-filemtime($this->loginFILE)-60;
#         echo "登陆不存在或您已经超时(".$outtime."秒)...";
#       }
#     }
#   }
#   function Wfrom(){
#   global $_POST;
#   if(!file_exists($this->loginFILE) ||(time()-filemtime($this->loginFILE))>60){    //登陆失败
#   echo <<<LOGINFORM
#   <Form action="$_SERVER[PHP_SELF]" method="post" name="Loginform">
#     <table cellpadding=0 border=0>
#     <tr><td>
#     用户名:<td><input type="text" name="LoginUser"></span><br>
#     <tr><td>密码:<td><input type="password" name="LoginPw"></span><br>
#      <tr><td> <td><input type="button" value=" Login " onclick="if(this.form.LoginUser.length*this.form.LoginPw.length!=0){this.form.submit();}else{return false;}">
#     </table>
#   </form>
# LOGINFORM;
#   }else{
#     echo "已有用户登陆";
#   }
#   }
# }
# $D=new CC;
# $D->check();
# $D->Wfrom();
# ?>

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