如何在30分钟后过期PHP会话?

我需要保持一个会话存活30分钟，然后销毁它。

当前回答

只存储当前时间，如果它超过30分钟比较然后销毁当前会话。

2020-01-24 08:42:04

其他回答

使用下面这样的函数其实很简单。它使用数据库表名'sessions'与字段'id'和'time'。

每次当用户再次访问您的站点或服务时，您都应该调用这个函数来检查它的返回值是否为TRUE。如果是FALSE，用户已经过期，会话将被销毁(注意:这个函数使用一个数据库类来连接和查询数据库，当然你也可以在你的函数中这样做或类似的事情):

function session_timeout_ok() {
    global $db;
    $timeout = SESSION_TIMEOUT; //const, e.g. 6 * 60 for 6 minutes
    $ok = false;
    $session_id = session_id();
    $sql = "SELECT time FROM sessions WHERE session_id = '".$session_id."'";
    $rows = $db->query($sql);
    if ($rows === false) {
        //Timestamp could not be read
        $ok = FALSE;
    }
    else {
        //Timestamp was read succesfully
        if (count($rows) > 0) {
            $zeile = $rows[0];
            $time_past = $zeile['time'];
            if ( $timeout + $time_past < time() ) {
                //Time has expired
                session_destroy();
                $sql = "DELETE FROM sessions WHERE session_id = '" . $session_id . "'";
                $affected = $db -> query($sql);
                $ok = FALSE;
            }
            else {
                //Time is okay
                $ok = TRUE;
                $sql = "UPDATE sessions SET time='" . time() . "' WHERE session_id = '" . $session_id . "'";
                $erg = $db -> query($sql);
                if ($erg == false) {
                    //DB error
                }
            }
        }
        else {
            //Session is new, write it to database table sessions
            $sql = "INSERT INTO sessions(session_id,time) VALUES ('".$session_id."','".time()."')";
            $res = $db->query($sql);
            if ($res === FALSE) {
                //Database error
                $ok = false;
            }
            $ok = true;
        }
        return $ok;
    }
    return $ok;
}

2014-01-24 08:40:46

只存储当前时间，如果它超过30分钟比较然后销毁当前会话。

2020-01-24 08:42:04

PHP是如何处理会话的，初学者很难理解。这可能会帮助他们概述会话的工作原理: 会话如何工作(自定义会话处理程序)

2020-05-31 20:45:41

PHP会话在30分钟内到期的简单方法。

注意:如果你想改变时间，只需要改变30和你想要的时间，不要改变* 60:这将给出分钟。

分钟:(30 * 60) (n * 24 * 60 * 60) n = no天

<?php
    session_start();
?>

<html>
    <form name="form1" method="post">
        <table>
            <tr>
                <td>Username</td>
                <td><input type="text" name="text"></td>
            </tr>
            <tr>
                <td>Password</td>
                <td><input type="password" name="pwd"></td>
            </tr>
            <tr>
                <td><input type="submit" value="SignIn" name="submit"></td>
            </tr>
        </table>
    </form>
</html>

<?php
    if (isset($_POST['submit'])) {
        $v1 = "FirstUser";
        $v2 = "MyPassword";
        $v3 = $_POST['text'];
        $v4 = $_POST['pwd'];
        if ($v1 == $v3 && $v2 == $v4) {
            $_SESSION['luser'] = $v1;
            $_SESSION['start'] = time(); // Taking now logged in time.
            // Ending a session in 30 minutes from the starting time.
            $_SESSION['expire'] = $_SESSION['start'] + (30 * 60);
            header('Location: http://localhost/somefolder/homepage.php');
        } else {
            echo "Please enter the username or password again!";
        }
    }
?>

HomePage.php

<?php
    session_start();

    if (!isset($_SESSION['luser'])) {
        echo "Please Login again";
        echo "<a href='http://localhost/somefolder/login.php'>Click Here to Login</a>";
    }
    else {
        $now = time(); // Checking the time now when home page starts.

        if ($now > $_SESSION['expire']) {
            session_destroy();
            echo "Your session has expired! <a href='http://localhost/somefolder/login.php'>Login here</a>";
        }
        else { //Starting this else one [else1]
?>
            <!-- From here all HTML coding can be done -->
            <html>
                Welcome
                <?php
                    echo $_SESSION['luser'];
                    echo "<a href='http://localhost/somefolder/logout.php'>Log out</a>";
                ?>
            </html>
<?php
        }
    }
?>

LogOut.php

<?php
    session_start();
    session_destroy();
    header('Location: http://localhost/somefolder/login.php');
?>

2011-09-13 06:39:12

使用session_set_cookie_params函数来做到这一点。

有必要在session_start()调用之前调用这个函数。

试试这个:

$lifetime = strtotime('+30 minutes', 0);

session_set_cookie_params($lifetime);

session_start();

详见:http://php.net/manual/function.session-set-cookie-params.php

2016-05-13 12:43:13

如何在30分钟后过期PHP会话?

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