[注销session]session_unregister和session_destroy把我弄糊涂了

剑心通明

<?php
session_start();
if($_POST['destroy']=="Destroy Session"){
        session_unregister("destroy");
        session_destroy();
        session_unregister("name");
} else {
        if(!session_is_registered(name)) {
                session_register("name");
                $_SESSION['name'] = "Spike";
                }
}
?>
<p>SESSID: <? $id = session_id();echo $id;?>
<p>Name: <?=$_SESSION['name']?>
<form action=session2.php method=post>
<input type="submit" name="reload" value="Reload Session"><br>
<input type="submit" name="destroy" value="Destroy Session">
</form>

为什么我点击一次Destroy Session的时候，name还显示，只是不显示Id了，只有点第二次name才不显示？
session_unregister("name");不是已经把name变量给删除了吗？怎么还能打印出$_SESSION['name']？


被领导逼着学php了，没什么基础，请各位帮忙，多谢！

alinker

被领导逼着学PHP?

那你就别学~

alinker

如果你用PHP5,肯定不用session_unregister了
直接session_destroy();
就将$_SESSION里值全部清空了~

剑心通明

我用的php4

剑心通明

session_unregister("destroy");
        session_destroy();
        session_unregister("name");
php4里面的session_destroy();不能把所有的session变量删除吗？

alinker

我一碰PHP,就是5,可能是有差异~

你以前在哪个版混~?

发贴1万3,精华39, PFPF~

alinker

查看了一下,

原来你以前整BSD,搞系统维护/?

呵呵~

HonestQiao

看看这个：
http://w.yi.org/ftp/FAPM/PHP/zh/function.session-destroy.html

看最后面的。

剑心通明

http://www.phpx.com/man/php4gb/group.php-54.php
我看的这个手册，怎么根本就没有session_unset();
到底session有几个函数可用？糊涂了

alinker

原帖由 剑心通明 于 2006-6-2 09:50 发表
http://www.phpx.com/man/php4gb/group.php-54.php
我看的这个手册，怎么根本就没有session_unset();
到底session有几个函数可用？糊涂了

不会吧~
session_destroy
(PHP 4, PHP 5)

session_destroy -- Destroys all data registered to a session
Description
bool session_destroy ( void )


session_destroy() destroys all of the data associated with the current session. It does not unset any of the global variables associated with the session, or unset the session cookie.

In order to kill the session altogether, like to log the user out, the session id must also be unset. If a cookie is used to propagate the session id (default behavior), then the session cookie must be deleted. setcookie() may be used for that.

如果成功则返回 TRUE，失败则返回 FALSE。

例子 1. Destroying a session with $_SESSION

<?php
// Initialize the session.
// If you are using session_name("something"), don't forget it now!
session_start();

// Unset all of the session variables.
$_SESSION = array();

// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (isset($_COOKIE[session_name()])) {
    setcookie(session_name(), '', time()-42000, '/');
}

// Finally, destroy the session.
session_destroy();
?>  



注: Only use session_unset() for older deprecated code that does not use $_SESSION.




session_unset
(PHP 4, PHP 5)

session_unset --  Free all session variables
Description
void session_unset ( void )


The session_unset() function frees all session variables currently registered.

注: If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is used, use unset() to unregister a session variable, i.e. unset ($_SESSION['varname']);.



session_unregister
(PHP 4, PHP 5)

session_unregister --  Unregister a global variable from the current session
Description
bool session_unregister ( string name )


session_unregister() unregisters the global variable named name from the current session.

This function returns TRUE when the variable is successfully unregistered from the session.

注: If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is used, use unset() to unregister a session variable. Do not unset() $_SESSION itself as this will disable the special function of the $_SESSION superglobal.