How to expire PHP session after a period of time

Expire the session after some peiod of time by using in php.

Basically, two methods are available to destory the sessions.

   1. session_destroy()
   2. unset($_SESSION['testvaraible'])
   3. setting the time out for this session

 1.session_destroy()

     if we will call the session_destroy(), it will destroy all the SESSION variable.It is no need any other parameters.

<?php
 session_destroy();
?>

2. unset($_SESSION['testvaraible'])

       When we will call the unset() ,it will destroyed the particular variable.
    Example:
   
     

<?php 
 // Destroyed the session variable "testvaraible".
 unset($_SESSION['testvaraible']);

?>

3. setting the time out for this session

<?php

if isset($_SESSION['LAST_MINITUte_ACTIVITY']) && 
(time() - $_SESSION['LAST_MINITUte_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
}

// update last activity time stamp
$_SESSION['LAST_MINITUte_ACTIVITY'] = time(); 

/*

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
    // change session ID for the current session
    // an invalidate old session ID
    session_regenerate_id(true);    

    $_SESSION['CREATED'] = time();  // update creation time
}

4.session.gc_maxlifetime()

   By using php ini_set session.gc_maxlifetime also we will expire the session.

<?php
 ini_set session.gc_maxlifetime
?>

 
   

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2. Difference between cookies and sessions in php
3. How to create a .webp image in PHP
4. How to expire PHP session after a period of time
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How to describe the single field in table by using mysql?

mysql> desc codingslover;
+----------+-------------+------+-----+---------+-------+
| Field    | Type        | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| ProjId   | varchar(20) | NO   | PRI | NULL    |       |
| BranchId | int(11)     | YES  |     | NULL    |       |
| AddedOn  | datetime    | YES  |     | NULL    |       |
| Status   | int(11)     | YES  |     | NULL    |       |
+----------+-------------+------+-----+---------+-------+
4 rows in set (0.00 sec)

mysql> desc codingslover ProjId;
+---------+-------------+------+-----+---------+-------+
| Field   | Type        | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| ProjId  | varchar(20) | NO   | PRI | NULL    |       |
+---------+-------------+------+-----+---------+-------+
1 row in set (0.00 sec)

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1. 413 “Request Entity Too Large” error with uploading a file
2. Difference between cookies and sessions in php
3. How to create a .webp image in PHP
4. How to expire PHP session after a period of time
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How to resolved when Logged out sessions get restored by back button?

How to resolved when Logged out sessions get restored by back button?

When we log out the sessions , We clear the cookies in browser. But when we press the back button after logging out the session gets restored. 

Link :
http://www.codingslover.com/2015/01/How-to-resolved-when-Logged-out-sessions-get-restored-by-back-button.html

Solution:

 header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
 header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past

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why javascript contains property is not working in chrome browser?

Contains() Property in javascript.,it is working fine in Mozila Firebox only.It will not support Chrome Browser,Internet Browser,Safari,Opera browser.

Mozila Browser :

  var ClearFilterValue  = 'family Schools';
    if(ClearFilterValue.contains("family")== true) {
   alert('Success');
    } 
  

Chorme & Mozila Firebox Browser :

    The below javascript index() properity will working for both chrome and mozile firbox.It is functionality similar to contains property.

var ClearFilterValue  = 'family Schools';
alert(ClearFilterValue.indexOf("family") != -1);

var n  =   str.indexOf("family"); 
if(n >= 0) { 
    alert(success); 
}

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