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Detailed explanation of how PHP sessions are destroyed after 30 minutes (with code examples)

藏色散人

Nov 14, 2022 pm 04:34 PM

phpsession

This article will introduce you to the issue of how to specify the time to destroy the PHP session. Here is a detailed introduction to how to destroy the session through the session_destroy() function. I hope it will be helpful to friends in need~

Detailed explanation of how PHP sessions are destroyed after 30 minutes (with code examples)

PHP has a core function session_destroy() to clear all session values. It is a simple function with no parameters that returns a boolean value of true or false.

PHP's session ID is stored in a cookie by default. Generally, the name of the session cookie file is PHPSESSID. The session_destroy function will not cancel the sessionid in the cookie.

In order to "completely" destroy the session, the session ID must also be unset.

This quick example uses session_destroy() to destroy the session. It uses the set_cookie() method to kill the entire session with an expired PHP session ID.

Quick example

destroy-session.php

<?php
// Always remember to initialize the session,
// even before attempting to destroy it.

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

// delete the session cookie also to destroy the session
if (ini_get("session.use_cookies")) {
    $cookieParam = session_get_cookie_params();
    setcookie(session_name(), &#39;&#39;, time() - 42000, $cookieParam["path"], $cookieParam["domain"], $cookieParam["secure"], $cookieParam["httponly"]);
}

// as a last step, destroy the session.
session_destroy();

Note: Use session_start() to restart a PHP session after it is destroyed. Use PHP$_SESSION to unset specific session variables. For older PHP versions, use session_unset(). PHP session destruction output [Recommended learning: PHP video tutorial]

Let us create a login sample code to use PHP session, session_destroy etc. It allows users to log in and out from the current session. If you are looking for complete user registration and login in PHP script then use this code. This sample provides automatic login session expiration functionality.

This form posts the username and password entered by the user. It verifies login credentials in PHP. After a successful login, it stores the login status into the PHP session. It sets the expiration time to 30 minutes from the last login time. It stores the last login time and expiration time into the PHP session. These two session variables are used to automatically expire the session.

<?php
session_start();
$expirtyMinutes = 1;
?>
<html>
<head>
<title>PHP Session Destroy after 30 Minutes</title>
<link rel=&#39;stylesheet&#39; href=&#39;style.css&#39; type=&#39;text/css&#39; />
<link rel=&#39;stylesheet&#39; href=&#39;form.css&#39; type=&#39;text/css&#39; />
</head>
<body>
    <div class="phppot-container">
        <h1 id="Login">Login</h1>
        <form name="login-form" method="post">
            <table>
                <tr>
                    <td>Username</td>
                    <td><input type="text" name="username"></td>
                </tr>
                <tr>
                    <td>Password</td>
                    <td><input type="password" name="password"></td>
                </tr>
                <tr>
                    <td><input type="submit" value="Sign in"
                        name="submit"></td>
                </tr>
            </table>
        </form>
<?php
if (isset($_POST[&#39;submit&#39;])) {
    $usernameRef = "admin";
    $passwordRef = "test";
    $username = $_POST[&#39;username&#39;];
    $password = $_POST[&#39;password&#39;];

    // here in this example code focus is session destroy / expiry only
    // refer for registration and login code https://phppot.com/php/user-registration-in-php-with-login-form-with-mysql-and-code-download/
    if ($usernameRef == $username && $passwordRef == $password) {
        $_SESSION[&#39;login-user&#39;] = $username;
        // login time is stored as reference
        $_SESSION[&#39;ref-time&#39;] = time();
        // Storing the logged in time.
        // Expiring session in 30 minutes from the login time.
        // See this is 30 minutes from login time. It is not &#39;last active time&#39;.
        // If you want to expire after last active time, then this time needs
        // to be updated after every use of the system.
        // you can adjust $expirtyMinutes as per your need
        // for testing this code, change it to 1, so that the session
        // will expire in one minute
        // set the expiry time and
        $_SESSION[&#39;expiry-time&#39;] = time() + ($expirtyMinutes * 60);
        // redirect to home
        // do not include home page, it should be a redirect
        header(&#39;Location: home.php&#39;);
    } else {
        echo "Wrong username or password. Try again!";
    }
}
?>
</div>
</body>
</html>

This is the target page for redirection after login. If a login session exists, it will display a logout link. Once it times out it will call destroy session. php code to destroy all sessions. If the 30 minute expiration time is reached or the session is empty, it will ask the user to log in.

home.php

<?php
session_start();
?>
<html>
<head>
<title>PHP Session Destroy after 30 Minutes</title>
<link rel=&#39;stylesheet&#39; href=&#39;style.css&#39; type=&#39;text/css&#39; />
<link rel=&#39;stylesheet&#39; href=&#39;form.css&#39; type=&#39;text/css&#39; />
</head>
<body>
    <div class="phppot-container">
<?php
if (! isset($_SESSION[&#39;login-user&#39;])) {
    echo "Login again!<br><br>";
    echo "<a href=&#39;login.php&#39;>Login</a>";
} else {
    $currentTime = time();
    if ($currentTime > $_SESSION[&#39;expiry-time&#39;]) {
        require_once __DIR__ . &#39;/destroy-session.php&#39;;
        echo "Session expired!<br><br><a href=&#39;login.php&#39;>Login</a>";
    } else {
        ?>
        <h1 id="Welcome-nbsp-php-nbsp-echo-nbsp-SESSION-login-user">Welcome <?php echo $_SESSION[&#39;login-user&#39;];?>!</h1>
        <a href=&#39;logout.php&#39;>Log out</a>
<?php
    }
}
?>
</div>
</body>
</html>

This PHP code is for users who wish to log out before their session expires.

It destroys the session by asking it to be destroyed. php code. It then redirects the user to the login page. logout.php

<?php
session_start();
require_once __DIR__ . &#39;/destroy-session.php&#39;;
header(&#39;Location: login.php&#39;);
?>

I hope this example helps understand how to destroy a PHP session. And, this is a perfect scenario to explain the need to destroy sessions.

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