discuz clears the session, causing the session saving mechanism to fail, and the session cannot be updated and resolved_PHP tutorial

[php]




function userErrorHandler() {
$e = func_get_args();
echo '

<br>----------Running error---------:<br>' .print_r($e, 1).'<br>----------Run error---------<br>

';
}
set_error_handler("userErrorHandler");
set_exception_handler("userErrorHandler");

function shutdown() {
$a=error_get_last();
if($a != null) echo '

<br>++++++Low-level error+++++<br>'. print_r($a, 1).'<br>++++++Low-level error+++++<br>

'; 
}

register_shutdown_function('shutdown'); //This script will not be run if exit is used


switch($_GET['how']) {
case 's'://set
session_start();
          $_SESSION['qidizi'] = rand();
echo $_SESSION['qidizi'];
break;
case 'u'://unset
session_start();
          $_SESSION['qidizi'] = 'qidiziUNSET';
echo $_SESSION['qidizi'];
break;
case 'g'://get
session_start();
        var_dump($_SESSION);
break;
case 'c'://clean
session_start();
echo 'get---------
';
        var_dump($_SESSION);
echo '
edit-------/>';
         $_SESSION['qidizi'] = 'qidiziCLEAN';
        var_dump($_SESSION);
echo '
under clean---------
';
          $GLOBALS['_SESSION']=null;unset($GLOBALS['_SESSION']);//After unset, the session will become invalid
        empty($GLOBALS['_SESSION']) && ($GLOBALS['_SESSION']['qidiziReBuid'] = '1');//This sentence cannot rebuild/retrigger the session saving mechanism
session_write_close();//Save session changes in advance, discuz clears the session and causes the saving mechanism to fail, by qidizi, this sentence is valid, submit and save
        var_dump($_SESSION);
break;
}

function userErrorHandler() {
$e = func_get_args();
echo '

<br>----------Running error---------:<br>' .print_r($e, 1).'<br>----------Run error---------<br>

';
}
set_error_handler("userErrorHandler");
set_exception_handler("userErrorHandler");

function shutdown() {
$a=error_get_last();
if($a != null) echo '

<br>++++++Low-level error+++++<br>'. print_r($a, 1).'<br>++++++Low-level error+++++<br>

';
}

register_shutdown_function('shutdown');//This script will not be run if exit is used

switch($_GET['how']) {
 case 's'://set
  session_start();
  $_SESSION['qidizi'] = rand();
  echo $_SESSION['qidizi'];
  break;
 case 'u'://unset
  session_start();
  $_SESSION['qidizi'] = 'qidiziUNSET';
  echo $_SESSION['qidizi'];
  break;
 case 'g'://get
  session_start();
  var_dump($_SESSION);
  break;
 case 'c'://clean
  session_start();
  echo 'get---------
';
  var_dump($_SESSION);
  echo '
edit-------/>';
  $_SESSION['qidizi'] = 'qidiziCLEAN';
  var_dump($_SESSION);
  echo '
under clean---------
';
  $GLOBALS['_SESSION']=null;unset($GLOBALS['_SESSION']);//unset后,session会失效
  empty($GLOBALS['_SESSION']) && ($GLOBALS['_SESSION']['qidiziReBuid'] = '1');//本句并不能重建/重触发session保存机制
   session_write_close();//提前保存session改变,discuz清除了session导致保存机制失败,by qidizi,这句话才有效,提交保存
  var_dump($_SESSION);
  break;
}
以上是测试代码

 

关键是在 $GLOBALS['_SESSION']=null; 这句.且

[php]
unset($GLOBALS['_SESSION']); 

unset($GLOBALS['_SESSION']);会让session在解析结束保存session的机制失败,看起来是这样的.不懂session自动保存的机制是怎么样的.演示代码中简单的重建并没有触发保存机制.

所以,后来我使用了提前调用方法提前保存我的session更改.

在discuz_application这个类中有对全局变量进行清空,

因为
正面面变量不需要保留,

    var $superglobal = array(
        'GLOBALS' => 1,
        '_GET' => 1,
        '_POST' => 1,
        '_REQUEST' => 1,
        '_COOKIE' => 1,
        '_SERVER' => 1,
        '_ENV' => 1,
        '_FILES' => 1,
    );

接着正面的代码就会对它进行清空

 

        foreach ($GLOBALS as $key => $value) {
            if (!isset($this->superglobal[$key])) {
                $GLOBALS[$key] = null; unset($GLOBALS[$key]);
            }
        }

最终效果出现如下的代码功能
关键是在 $GLOBALS['_SESSION']=null; 这句.

使用我上面的测试代码进行演示:
正面的说法指 local.q/t.php?how=s(设置)|g(获取)|u(修改)|c(清空)

操作步骤1 设置 -> 获取 -> 修改 -> 获取     ==== 结果,修改能反馈到获取时的结果中
操作步骤2 设置->获取 -> 修改-> 获取 -> 清空 -> 获取 ====结果:获取修改后数据正常.获取清空的数据失败,获取到的是修改时的数据.(注意这里的测试并没有把提前)

 

问题就是disucz的init方法导致清空相同的效果.导致某些情况下的使用session会出现清除不掉的问题.简单就是导致验证码输入一次就可以无限提交.

虽然可以使用其它方法来防止.但是这个session的正常的机制被破坏了.问题比较多.

目前我在写这个时,还不清楚使用什么方法可以恢复它的机制.上面的尝试方法并不起作用.

 

 

 

After testing, I found that it is reasonable to use session_write_close(); to save the session in advance. This can solve the problem I encountered. For some reason, after clearing the session, the automatic saving will fail. Active saving is required.

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