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I have a page that logs users out after 10 seconds of idling,but it does so without displaying a message and I need to refresh the page to show that I'm logged out. How do I display a message like "Logged out due to inactivity" with an okay button and when I click on it, it redirects back to index.php?
session_start();
$timeout = 10;
// Check if the timeout field exists.
if(isset($_SESSION['timeout'])) {
// See if the number of seconds since the last
// visit is larger than the timeout period.
$duration = time() - (int)$_SESSION['timeout'];
if($duration > $timeout) {
?>
<script type="text/javascript">
alert("Your session will expire soon!");
<?php header("location:../../index.php"); ?>
</script>
<?php
}
// Destroy the session and restart it.
session_destroy();
session_start();
}
// Update the timout field with the current time.
$_SESSION['timeout'] = time();
I have a website in php which has a log in system. I would like to log the user out after 10min if the website is inactive. To do this I was going to use the following code:
session_start();
// set timeout period in seconds
$inactive = 600;
// check to see if $_SESSION['timeout'] is set
if(isset($_SESSION['timeout']) ) {
$session_life = time() - $_SESSION['start'];
if($session_life > $inactive) {
session_destroy();
header("Location: index.php");
}
}
$_SESSION['timeout'] = time();
However when I run the website and refresh the page it logs out and directs the page to "index.php" even before the "600 seconds" have passed.
What might be the problem here and how can I know that the page has inactive?
Thanks a lot for your help.
session_start();
// set timeout period in seconds
$session_timeout = 600;
if (!isset($_SESSION['last_visit'])) { $_SESSION['last_visit'] = time(); } // I like brackets!
if((time() - $_SESSION['last_visit']) > $session_timeout) {
session_destroy();
header("Location: index.php"); // think about user feedback, "your session timed out" ... index.php?action=session_timeout
exit; // <= IMPORTANT !!!
}
$_SESSION['last_visit'] = time();
Where did you define $_SESSION['start' ]? I test this:
$session_life = time() - $_SESSION['start'];
echo $session_life ,' - ', $_SESSION['timeout'];
die();
And both $session_life and $_SESSION['timeout'] has the same values so the question is, which value takes $_SESSION['start']?
My web structure is
Header-of-page
Nav Link || iFrame
Footer
I'm Trying to handle session timeout, when session has timeout I'm trying to redirect page to login page, this works fine(session timeout).
Problem:
When I'm redirecting the page,login page is displayed in iFrame, which is not expected.
How can I redirect to login page(whole window),rather than opeing it in iFrame.
I Tried:
1. using header
2. using javascript(Commented)
<?php session_start();
$timeout = 1; // Set timeout minutes
$timeout = $timeout * 60; // Converts minutes to seconds
if (isset($_SESSION['timeout']))
{
$session_life = time() - $_SESSION['timeout'];
if ($session_life > $timeout)
{
session_destroy();
header("Location: login.php?msg=timeout");
// echo '<script language="javascript">';
// echo 'window.location.replace("login.php");';
// echo '</script>';
}
}
$_SESSION['timeout'] = time();
?>
Please guide me for this issue. Thanks!
Try this: window.top.location.href = "http://www.site.com";
As long as this is on the same domain name.
More here: Redirect parent window from an iframe action
use this one
in script window.parent.location='http://localhost/users/login.php'
or follow this link
https://forums.digitalpoint.com/threads/button-to-navigate-to-a-new-page-but-exit-the-iframe-too.1846291/
hope you will get solution.
create form with target="_parent" and action="login.php"
and submit using $(form).submit();
The problem here is than the iFrame is a another window in the partent window.
So when is begin redirected the iFrame only affect self (Not the parent or partents of the parent).
To don't use javascript we can put a link to login.php wich target the parent.
Goto login.php
_top will target the top window frame.
http://reference.sitepoint.com/html/a/target#target__li5 Read about target attribute set on _top.
The other method is using javascript:
window.top.location.assign("http://www.yoursite.com/login.php"); // Redirect
// window top frame to "http://yoursite.com/login.php"
Please read following links about javascript window documentation:
http://www.w3schools.com/jsref/prop_win_top.asp
http://www.w3schools.com/js/js_window_location.asp
In case yo want a "PHP" code, just use echo
http://www.php.net/manual/en/function.echo.php
I hope this mightly helps.
one of the probably mistakes,
if the encoding of this file is "UTF-8" it will create 2 hidden characters in the top of the file.
To fix this issue, try to change the encoding to "UTF-8 without BOM"
you can put a exit; after the redirect
<?php session_start();
$timeout = 1; // Set timeout minutes
$timeout = $timeout * 60; // Converts minutes to seconds
if (isset($_SESSION['timeout']))
{
$session_life = time() - $_SESSION['timeout'];
if ($session_life > $timeout)
{
session_destroy();
header("Location: login.php?msg=timeout");
exit(); // LOOK AT THIS LINE
// echo '<script language="javascript">';
// echo 'window.location.replace("login.php");';
// echo '</script>';
}
}
$_SESSION['timeout'] = time();
?>
Try this way. Php redirection works before JS redirection so browser never runs JS.
which that's the only way you can redirect whole window object.
<?php session_start();
$timeout = 1; // Set timeout minutes
$timeout = $timeout * 60; // Converts minutes to seconds
if (isset($_SESSION['timeout']))
{
$session_life = time() - $_SESSION['timeout'];
if ($session_life > $timeout)
{
session_destroy();
// header("Location: login.php?msg=timeout");
echo '<script language="javascript">window.top.location.href = "login.php?msg=timeout";</script>';
}
}
$_SESSION['timeout'] = time();
You would need to break the iframe. Try this..
if(this != top){
top.location.href = this.location.href;
}
OR (with doc reference)
if(this != top){
top.document.location.href = this.document.location.href;
}
Alternatively
this.top.location !== this.location && (this.top.location = this.location);
I am guessing this php being in the file running in the iframe in that case you have to instruct the parent window to redirect to login.
Echo the below code from php so when you page will render in browser, it will instruct the script to reload the page. But for the page not to load the rest of the page issue an exit(0). Your final script should look like below.
<?php session_start();
$timeout = 1; // Set timeout minutes
$timeout = $timeout * 60; // Converts minutes to seconds
if (isset($_SESSION['timeout']))
{
$session_life = time() - $_SESSION['timeout'];
if ($session_life > $timeout)
{
session_destroy();
echo '<script language="javascript">';
//Echo the exact full url to your login page
echo 'window.parent.location="login.php?msg=timeout"';
echo '</script>';
exit(0); // So script won't go further displaying the page
}
}
$_SESSION['timeout'] = time();
?>
Hope that helps.
Check this solution out. I would put it before the header to prevent flickering. This way, your page will be prevented from swallowing itself.
http://usablelayout.com/articles/automatically-break-out-iframe
<script type="text/javascript">
<!--
if (top.location!= self.location) {
top.location = self.location.href
}
//-->
</script>
If you are using the login action on the same page, Header redirection will not work.
you can use simple the window.location.href='url';
For the login , you have to send the login query to new page, from there you can easily redirect easily...
Try this one
php
echo "<script> window.location='forgot.php'</script>";
html
<META HTTP-EQUIV="REFRESH" CONTENT="3;URL=http://google.com">
I need to keep a session alive for 30 minutes and then destroy it.
You should implement a session timeout of your own. Both options mentioned by others (session.gc_maxlifetime and session.cookie_lifetime) are not reliable. I'll explain the reasons for that.
First:
session.gc_maxlifetime
session.gc_maxlifetime specifies the number of seconds after which data will be seen as 'garbage' and cleaned up. Garbage collection occurs during session start.
But the garbage collector is only started with a probability of session.gc_probability divided by session.gc_divisor. And using the default values for those options (1 and 100 respectively), the chance is only at 1%.
Well, you could simply adjust these values so that the garbage collector is started more often. But when the garbage collector is started, it will check the validity for every registered session. And that is cost-intensive.
Furthermore, when using PHP's default session.save_handler files, the session data is stored in files in a path specified in session.save_path. With that session handler, the age of the session data is calculated on the file's last modification date and not the last access date:
Note: If you are using the default file-based session handler, your filesystem must keep track of access times (atime). Windows FAT does not so you will have to come up with another way to handle garbage collecting your session if you are stuck with a FAT filesystem or any other filesystem where atime tracking is not available. Since PHP 4.2.3 it has used mtime (modified date) instead of atime. So, you won't have problems with filesystems where atime tracking is not available.
So it additionally might occur that a session data file is deleted while the session itself is still considered as valid because the session data was not updated recently.
And second:
session.cookie_lifetime
session.cookie_lifetime specifies the lifetime of the cookie in seconds which is sent to the browser. […]
Yes, that's right. This only affects the cookie lifetime and the session itself may still be valid. But it's the server's task to invalidate a session, not the client. So this doesn't help anything. In fact, having session.cookie_lifetime set to 0 would make the session’s cookie a real session cookie that is only valid until the browser is closed.
Conclusion / best solution:
The best solution is to implement a session timeout of your own. Use a simple time stamp that denotes the time of the last activity (i.e. request) and update it with every request:
if (isset($_SESSION['LAST_ACTIVITY']) && (time() - $_SESSION['LAST_ACTIVITY'] > 1800)) {
// last request was more than 30 minutes ago
session_unset(); // unset $_SESSION variable for the run-time
session_destroy(); // destroy session data in storage
}
$_SESSION['LAST_ACTIVITY'] = time(); // update last activity time stamp
Updating the session data with every request also changes the session file's modification date so that the session is not removed by the garbage collector prematurely.
You can also use an additional time stamp to regenerate the session ID periodically to avoid attacks on sessions like session fixation:
if (!isset($_SESSION['CREATED'])) {
$_SESSION['CREATED'] = time();
} else if (time() - $_SESSION['CREATED'] > 1800) {
// session started more than 30 minutes ago
session_regenerate_id(true); // change session ID for the current session and invalidate old session ID
$_SESSION['CREATED'] = time(); // update creation time
}
Notes:
session.gc_maxlifetime should be at least equal to the lifetime of this custom expiration handler (1800 in this example);
if you want to expire the session after 30 minutes of activity instead of after 30 minutes since start, you'll also need to use setcookie with an expire of time()+60*30 to keep the session cookie active.
Simple way of PHP session expiry in 30 minutes.
Note : if you want to change the time, just change the 30 with your desired time and do not change * 60: this will gives the minutes.
In minutes : (30 * 60)
In days : (n * 24 * 60 * 60 ) n = no of days
Login.php
<?php
session_start();
?>
<html>
<form name="form1" method="post">
<table>
<tr>
<td>Username</td>
<td><input type="text" name="text"></td>
</tr>
<tr>
<td>Password</td>
<td><input type="password" name="pwd"></td>
</tr>
<tr>
<td><input type="submit" value="SignIn" name="submit"></td>
</tr>
</table>
</form>
</html>
<?php
if (isset($_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');
?>
Is this to log the user out after a set time? Setting the session creation time (or an expiry time) when it is registered, and then checking that on each page load could handle that.
E.g.:
$_SESSION['example'] = array('foo' => 'bar', 'registered' => time());
// later
if ((time() - $_SESSION['example']['registered']) > (60 * 30)) {
unset($_SESSION['example']);
}
Edit: I've got a feeling you mean something else though.
You can scrap sessions after a certain lifespan by using the session.gc_maxlifetime ini setting:
Edit:
ini_set('session.gc_maxlifetime', 60*30);
This post shows a couple of ways of controlling the session timeout: http://bytes.com/topic/php/insights/889606-setting-timeout-php-sessions
IMHO the second option is a nice solution:
<?php
/***
* Starts a session with a specific timeout and a specific GC probability.
* #param int $timeout The number of seconds until it should time out.
* #param int $probability The probablity, in int percentage, that the garbage
* collection routine will be triggered right now.
* #param strint $cookie_domain The domain path for the cookie.
*/
function session_start_timeout($timeout=5, $probability=100, $cookie_domain='/') {
// Set the max lifetime
ini_set("session.gc_maxlifetime", $timeout);
// Set the session cookie to timout
ini_set("session.cookie_lifetime", $timeout);
// Change the save path. Sessions stored in teh same path
// all share the same lifetime; the lowest lifetime will be
// used for all. Therefore, for this to work, the session
// must be stored in a directory where only sessions sharing
// it's lifetime are. Best to just dynamically create on.
$seperator = strstr(strtoupper(substr(PHP_OS, 0, 3)), "WIN") ? "\\" : "/";
$path = ini_get("session.save_path") . $seperator . "session_" . $timeout . "sec";
if(!file_exists($path)) {
if(!mkdir($path, 600)) {
trigger_error("Failed to create session save path directory '$path'. Check permissions.", E_USER_ERROR);
}
}
ini_set("session.save_path", $path);
// Set the chance to trigger the garbage collection.
ini_set("session.gc_probability", $probability);
ini_set("session.gc_divisor", 100); // Should always be 100
// Start the session!
session_start();
// Renew the time left until this session times out.
// If you skip this, the session will time out based
// on the time when it was created, rather than when
// it was last used.
if(isset($_COOKIE[session_name()])) {
setcookie(session_name(), $_COOKIE[session_name()], time() + $timeout, $cookie_domain);
}
}
Well i understand the aboves answers are correct but they are on application level, why don't we simply use .htaccess file to set the expire time ?
<IfModule mod_php5.c>
#Session timeout
php_value session.cookie_lifetime 1800
php_value session.gc_maxlifetime 1800
</IfModule>
Use the session_set_cookie_params function to do this.
It is necessary to call this function before the session_start() call.
Try this:
$lifetime = strtotime('+30 minutes', 0);
session_set_cookie_params($lifetime);
session_start();
See more in: http://php.net/manual/function.session-set-cookie-params.php
if (isSet($_SESSION['started'])){
if((mktime() - $_SESSION['started'] - 60*30) > 0){
//Logout, destroy session, etc.
}
}
else {
$_SESSION['started'] = mktime();
}
It's actually easy with a function like the following. It uses database table name 'sessions' with fields 'id' and 'time'.
Every time when the user visits your site or service again you should invoke this function to check if its return value is TRUE. If it's FALSE the user has expired and the session will be destroyed (Note: This function uses a database class to connect and query the database, of course you could also do it inside your function or something like that):
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;
}
Store a timestamp in the session
<?php
$user = $_POST['user_name'];
$pass = $_POST['user_pass'];
require ('db_connection.php');
// Hey, always escape input if necessary!
$result = mysql_query(sprintf("SELECT * FROM accounts WHERE user_Name='%s' AND user_Pass='%s'", mysql_real_escape_string($user), mysql_real_escape_string($pass));
if( mysql_num_rows( $result ) > 0)
{
$array = mysql_fetch_assoc($result);
session_start();
$_SESSION['user_id'] = $user;
$_SESSION['login_time'] = time();
header("Location:loggedin.php");
}
else
{
header("Location:login.php");
}
?>
Now, Check if the timestamp is within the allowed time window (1800 seconds is 30 minutes)
<?php
session_start();
if( !isset( $_SESSION['user_id'] ) || time() - $_SESSION['login_time'] > 1800)
{
header("Location:login.php");
}
else
{
// uncomment the next line to refresh the session, so it will expire after thirteen minutes of inactivity, and not thirteen minutes after login
//$_SESSION['login_time'] = time();
echo ( "this session is ". $_SESSION['user_id'] );
//show rest of the page and all other content
}
?>
Please use following block of code in your include file which loaded in every pages.
$expiry = 1800 ;//session expiry required after 30 mins
if (isset($_SESSION['LAST']) && (time() - $_SESSION['LAST'] > $expiry)) {
session_unset();
session_destroy();
}
$_SESSION['LAST'] = time();
This was an eye-opener for me, what Christopher Kramer wrote in 2014 on
https://www.php.net/manual/en/session.configuration.php#115842
On debian (based) systems, changing session.gc_maxlifetime at runtime has no real effect. Debian disables PHP's own garbage collector by setting session.gc_probability=0. Instead it has a cronjob running every 30 minutes (see /etc/cron.d/php5) that cleans up old sessions. This cronjob basically looks into your php.ini and uses the value of session.gc_maxlifetime there to decide which sessions to clean (see /usr/lib/php5/maxlifetime). [...]
How PHP handles sessions is quite confusing for beginners to understand. This might help them by giving an overview of how sessions work:
how sessions work(custom-session-handlers)
Use this class for 30 min
class Session{
public static function init(){
ini_set('session.gc_maxlifetime', 1800) ;
session_start();
}
public static function set($key, $val){
$_SESSION[$key] =$val;
}
public static function get($key){
if(isset($_SESSION[$key])){
return $_SESSION[$key];
} else{
return false;
}
}
public static function checkSession(){
self::init();
if(self::get("adminlogin")==false){
self::destroy();
header("Location:login.php");
}
}
public static function checkLogin(){
self::init();
if(self::get("adminlogin")==true){
header("Location:index.php");
}
}
public static function destroy(){
session_destroy();
header("Location:login.php");
}
}
Using timestamp...
<?php
if (!isset($_SESSION)) {
$session = session_start();
}
if ($session && !isset($_SESSION['login_time'])) {
if ($session == 1) {
$_SESSION['login_time']=time();
echo "Login :".$_SESSION['login_time'];
echo "<br>";
$_SESSION['idle_time']=$_SESSION['login_time']+20;
echo "Session Idle :".$_SESSION['idle_time'];
echo "<br>";
} else{
$_SESSION['login_time']="";
}
} else {
if (time()>$_SESSION['idle_time']){
echo "Session Idle :".$_SESSION['idle_time'];
echo "<br>";
echo "Current :".time();
echo "<br>";
echo "Session Time Out";
session_destroy();
session_unset();
} else {
echo "Logged In<br>";
}
}
?>
I have used 20 seconds to expire the session using timestamp.
If you need 30 min add 1800 (30 min in seconds)...
You can straight use a DB to do it as an alternative. I use a DB function to do it that I call chk_lgn.
Check login checks to see if they are logged in or not and, in doing so, it sets the date time stamp of the check as last active in the user's db row/column.
I also do the time check there. This works for me for the moment as I use this function for every page.
P.S. No one I had seen had suggested a pure DB solution.
Here you can set the hours
$lifespan = 1800;
ini_set('session.gc_maxlifetime', $lifespan); //default life time
Just Store the current time and If it exceeds 30 minutes by comparing then destroy the current session.
I need to keep a session alive for 30 minutes and then destroy it.
You should implement a session timeout of your own. Both options mentioned by others (session.gc_maxlifetime and session.cookie_lifetime) are not reliable. I'll explain the reasons for that.
First:
session.gc_maxlifetime
session.gc_maxlifetime specifies the number of seconds after which data will be seen as 'garbage' and cleaned up. Garbage collection occurs during session start.
But the garbage collector is only started with a probability of session.gc_probability divided by session.gc_divisor. And using the default values for those options (1 and 100 respectively), the chance is only at 1%.
Well, you could simply adjust these values so that the garbage collector is started more often. But when the garbage collector is started, it will check the validity for every registered session. And that is cost-intensive.
Furthermore, when using PHP's default session.save_handler files, the session data is stored in files in a path specified in session.save_path. With that session handler, the age of the session data is calculated on the file's last modification date and not the last access date:
Note: If you are using the default file-based session handler, your filesystem must keep track of access times (atime). Windows FAT does not so you will have to come up with another way to handle garbage collecting your session if you are stuck with a FAT filesystem or any other filesystem where atime tracking is not available. Since PHP 4.2.3 it has used mtime (modified date) instead of atime. So, you won't have problems with filesystems where atime tracking is not available.
So it additionally might occur that a session data file is deleted while the session itself is still considered as valid because the session data was not updated recently.
And second:
session.cookie_lifetime
session.cookie_lifetime specifies the lifetime of the cookie in seconds which is sent to the browser. […]
Yes, that's right. This only affects the cookie lifetime and the session itself may still be valid. But it's the server's task to invalidate a session, not the client. So this doesn't help anything. In fact, having session.cookie_lifetime set to 0 would make the session’s cookie a real session cookie that is only valid until the browser is closed.
Conclusion / best solution:
The best solution is to implement a session timeout of your own. Use a simple time stamp that denotes the time of the last activity (i.e. request) and update it with every request:
if (isset($_SESSION['LAST_ACTIVITY']) && (time() - $_SESSION['LAST_ACTIVITY'] > 1800)) {
// last request was more than 30 minutes ago
session_unset(); // unset $_SESSION variable for the run-time
session_destroy(); // destroy session data in storage
}
$_SESSION['LAST_ACTIVITY'] = time(); // update last activity time stamp
Updating the session data with every request also changes the session file's modification date so that the session is not removed by the garbage collector prematurely.
You can also use an additional time stamp to regenerate the session ID periodically to avoid attacks on sessions like session fixation:
if (!isset($_SESSION['CREATED'])) {
$_SESSION['CREATED'] = time();
} else if (time() - $_SESSION['CREATED'] > 1800) {
// session started more than 30 minutes ago
session_regenerate_id(true); // change session ID for the current session and invalidate old session ID
$_SESSION['CREATED'] = time(); // update creation time
}
Notes:
session.gc_maxlifetime should be at least equal to the lifetime of this custom expiration handler (1800 in this example);
if you want to expire the session after 30 minutes of activity instead of after 30 minutes since start, you'll also need to use setcookie with an expire of time()+60*30 to keep the session cookie active.
Simple way of PHP session expiry in 30 minutes.
Note : if you want to change the time, just change the 30 with your desired time and do not change * 60: this will gives the minutes.
In minutes : (30 * 60)
In days : (n * 24 * 60 * 60 ) n = no of days
Login.php
<?php
session_start();
?>
<html>
<form name="form1" method="post">
<table>
<tr>
<td>Username</td>
<td><input type="text" name="text"></td>
</tr>
<tr>
<td>Password</td>
<td><input type="password" name="pwd"></td>
</tr>
<tr>
<td><input type="submit" value="SignIn" name="submit"></td>
</tr>
</table>
</form>
</html>
<?php
if (isset($_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');
?>
Is this to log the user out after a set time? Setting the session creation time (or an expiry time) when it is registered, and then checking that on each page load could handle that.
E.g.:
$_SESSION['example'] = array('foo' => 'bar', 'registered' => time());
// later
if ((time() - $_SESSION['example']['registered']) > (60 * 30)) {
unset($_SESSION['example']);
}
Edit: I've got a feeling you mean something else though.
You can scrap sessions after a certain lifespan by using the session.gc_maxlifetime ini setting:
Edit:
ini_set('session.gc_maxlifetime', 60*30);
This post shows a couple of ways of controlling the session timeout: http://bytes.com/topic/php/insights/889606-setting-timeout-php-sessions
IMHO the second option is a nice solution:
<?php
/***
* Starts a session with a specific timeout and a specific GC probability.
* #param int $timeout The number of seconds until it should time out.
* #param int $probability The probablity, in int percentage, that the garbage
* collection routine will be triggered right now.
* #param strint $cookie_domain The domain path for the cookie.
*/
function session_start_timeout($timeout=5, $probability=100, $cookie_domain='/') {
// Set the max lifetime
ini_set("session.gc_maxlifetime", $timeout);
// Set the session cookie to timout
ini_set("session.cookie_lifetime", $timeout);
// Change the save path. Sessions stored in teh same path
// all share the same lifetime; the lowest lifetime will be
// used for all. Therefore, for this to work, the session
// must be stored in a directory where only sessions sharing
// it's lifetime are. Best to just dynamically create on.
$seperator = strstr(strtoupper(substr(PHP_OS, 0, 3)), "WIN") ? "\\" : "/";
$path = ini_get("session.save_path") . $seperator . "session_" . $timeout . "sec";
if(!file_exists($path)) {
if(!mkdir($path, 600)) {
trigger_error("Failed to create session save path directory '$path'. Check permissions.", E_USER_ERROR);
}
}
ini_set("session.save_path", $path);
// Set the chance to trigger the garbage collection.
ini_set("session.gc_probability", $probability);
ini_set("session.gc_divisor", 100); // Should always be 100
// Start the session!
session_start();
// Renew the time left until this session times out.
// If you skip this, the session will time out based
// on the time when it was created, rather than when
// it was last used.
if(isset($_COOKIE[session_name()])) {
setcookie(session_name(), $_COOKIE[session_name()], time() + $timeout, $cookie_domain);
}
}
Well i understand the aboves answers are correct but they are on application level, why don't we simply use .htaccess file to set the expire time ?
<IfModule mod_php5.c>
#Session timeout
php_value session.cookie_lifetime 1800
php_value session.gc_maxlifetime 1800
</IfModule>
Use the session_set_cookie_params function to do this.
It is necessary to call this function before the session_start() call.
Try this:
$lifetime = strtotime('+30 minutes', 0);
session_set_cookie_params($lifetime);
session_start();
See more in: http://php.net/manual/function.session-set-cookie-params.php
if (isSet($_SESSION['started'])){
if((mktime() - $_SESSION['started'] - 60*30) > 0){
//Logout, destroy session, etc.
}
}
else {
$_SESSION['started'] = mktime();
}
It's actually easy with a function like the following. It uses database table name 'sessions' with fields 'id' and 'time'.
Every time when the user visits your site or service again you should invoke this function to check if its return value is TRUE. If it's FALSE the user has expired and the session will be destroyed (Note: This function uses a database class to connect and query the database, of course you could also do it inside your function or something like that):
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;
}
Store a timestamp in the session
<?php
$user = $_POST['user_name'];
$pass = $_POST['user_pass'];
require ('db_connection.php');
// Hey, always escape input if necessary!
$result = mysql_query(sprintf("SELECT * FROM accounts WHERE user_Name='%s' AND user_Pass='%s'", mysql_real_escape_string($user), mysql_real_escape_string($pass));
if( mysql_num_rows( $result ) > 0)
{
$array = mysql_fetch_assoc($result);
session_start();
$_SESSION['user_id'] = $user;
$_SESSION['login_time'] = time();
header("Location:loggedin.php");
}
else
{
header("Location:login.php");
}
?>
Now, Check if the timestamp is within the allowed time window (1800 seconds is 30 minutes)
<?php
session_start();
if( !isset( $_SESSION['user_id'] ) || time() - $_SESSION['login_time'] > 1800)
{
header("Location:login.php");
}
else
{
// uncomment the next line to refresh the session, so it will expire after thirteen minutes of inactivity, and not thirteen minutes after login
//$_SESSION['login_time'] = time();
echo ( "this session is ". $_SESSION['user_id'] );
//show rest of the page and all other content
}
?>
Please use following block of code in your include file which loaded in every pages.
$expiry = 1800 ;//session expiry required after 30 mins
if (isset($_SESSION['LAST']) && (time() - $_SESSION['LAST'] > $expiry)) {
session_unset();
session_destroy();
}
$_SESSION['LAST'] = time();
This was an eye-opener for me, what Christopher Kramer wrote in 2014 on
https://www.php.net/manual/en/session.configuration.php#115842
On debian (based) systems, changing session.gc_maxlifetime at runtime has no real effect. Debian disables PHP's own garbage collector by setting session.gc_probability=0. Instead it has a cronjob running every 30 minutes (see /etc/cron.d/php5) that cleans up old sessions. This cronjob basically looks into your php.ini and uses the value of session.gc_maxlifetime there to decide which sessions to clean (see /usr/lib/php5/maxlifetime). [...]
How PHP handles sessions is quite confusing for beginners to understand. This might help them by giving an overview of how sessions work:
how sessions work(custom-session-handlers)
Use this class for 30 min
class Session{
public static function init(){
ini_set('session.gc_maxlifetime', 1800) ;
session_start();
}
public static function set($key, $val){
$_SESSION[$key] =$val;
}
public static function get($key){
if(isset($_SESSION[$key])){
return $_SESSION[$key];
} else{
return false;
}
}
public static function checkSession(){
self::init();
if(self::get("adminlogin")==false){
self::destroy();
header("Location:login.php");
}
}
public static function checkLogin(){
self::init();
if(self::get("adminlogin")==true){
header("Location:index.php");
}
}
public static function destroy(){
session_destroy();
header("Location:login.php");
}
}
Using timestamp...
<?php
if (!isset($_SESSION)) {
$session = session_start();
}
if ($session && !isset($_SESSION['login_time'])) {
if ($session == 1) {
$_SESSION['login_time']=time();
echo "Login :".$_SESSION['login_time'];
echo "<br>";
$_SESSION['idle_time']=$_SESSION['login_time']+20;
echo "Session Idle :".$_SESSION['idle_time'];
echo "<br>";
} else{
$_SESSION['login_time']="";
}
} else {
if (time()>$_SESSION['idle_time']){
echo "Session Idle :".$_SESSION['idle_time'];
echo "<br>";
echo "Current :".time();
echo "<br>";
echo "Session Time Out";
session_destroy();
session_unset();
} else {
echo "Logged In<br>";
}
}
?>
I have used 20 seconds to expire the session using timestamp.
If you need 30 min add 1800 (30 min in seconds)...
You can straight use a DB to do it as an alternative. I use a DB function to do it that I call chk_lgn.
Check login checks to see if they are logged in or not and, in doing so, it sets the date time stamp of the check as last active in the user's db row/column.
I also do the time check there. This works for me for the moment as I use this function for every page.
P.S. No one I had seen had suggested a pure DB solution.
Here you can set the hours
$lifespan = 1800;
ini_set('session.gc_maxlifetime', $lifespan); //default life time
Just Store the current time and If it exceeds 30 minutes by comparing then destroy the current session.