PHP Session TimeOut Login Popup with jQuery & Ajax

My readers are asking that how do we display message to users that their sessions got expired. So I thought this tutorial will really useful to lots of web developer who working on session based websites. We should always notify our users that their PHP session timeout via popup or alert box. In this example, we are going to show timeout alert in a popup

I have used javascript timing event –  setInterval() – executes a function, over and over again, at specified time intervals

The setInterval() method will wait a specified number of milliseconds, and then execute a specified function, and it will continue to execute the function, once at every given time-interval.

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jQuery Code – executes every 5 seconds

var check_session;

function CheckForSession() {

var str="chksession=true";

jQuery.ajax({

type: "POST",

url: "chk_session.php",

data: str,

cache: false,

success: function(res){

if(res == "1") {

alert('Your session has been expired!');

}

}

});

}

check_session = setInterval(CheckForSession, 5000);

In the above javascript function called CheckForSession(), it will called every 5 seconds to check the sessions via chk_session.php

PHP code to check session timeout – chk_session.php

session_start();

$name = $_SESSION["w3name"];

if($name == '')

{

//session expired

echo "1";

} else {

//session not expired

echo "0";

}

If sessions are empty then the response will be “1”.

I hope you will like this tutorial. You can use this code in your live projects.

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Thanks!

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