我需要保持一个会话存活30分钟，然后销毁它。
当前回答
在会话中存储时间戳
<?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");
}
?>
现在，检查时间戳是否在允许的时间窗口内(1800秒是30分钟)
<?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 ". $_SESSION['user_id'] );
//show rest of the page and all other content
}
?>
其他回答
使用时间戳……
<?php
if (!isset($_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>";
}
}
?>
我用了20秒的时间戳使会话过期。
如果你需要30分钟，加1800(30分钟单位秒)…
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
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
login。
<?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 $_SESSION['luser'];
echo "<a href='http://localhost/somefolder/logout.php'>Log out</a>";
?>
</html>
<?php
}
}
?>
LogOut.php
<?php
session_start();
session_destroy();
header('Location: http://localhost/somefolder/login.php');
?>
if (isSet($_SESSION['started'])){
if((mktime() - $_SESSION['started'] - 60*30) > 0){
//Logout, destroy session, etc.
}
}
else {
$_SESSION['started'] = mktime();
}
这篇文章展示了控制会话超时的几种方法:http://bytes.com/topic/php/insights/889606-setting-timeout-php-sessions
恕我直言，第二个选择是一个很好的解决方案:
<?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);
}
}
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