How to set the session variable onclick in php

Question

I want to set session on clicking of link so after login user will redirect to last visited page.

for example:

Step1 : user opened home page.(seesion url set to home page

$_SESSION['url'] = $_SERVER['REQUEST_URI'])

step2 : Next in new tab user will open contact page (again session variable reset)

step3: user will come to home page and click to login link.(session not set because no reload of page)

step4: after login user will redirect to contact page.

but here i want user to be redirect where user clicked the link for login.

i tried with following code but it not working for me.

PHP code:

session_start();

$_SESSION['url'] = $_SERVER['REQUEST_URI'];

$url=$_SESSION['url'];

HTML code

<div class="gallery_div"> 
    <p>
      Please Click <strong><a href="login.php?link=<?php echo $url; ?>" style="color:#993b05"> here </a></strong>to login

    </p></div>

In login page

session_start();
if(isset($_GET['link']))
{
$_SESSION['url'] = $_GET['link'];

}

when redirect this page it coming with parameter and so page not found is coming. because only login.php is there.

can any one help me on this.

As problem: you not open session. Try call session_start before write to session. — ZhukV
– ZhukV, Commented May 28, 2014 at 6:20
Do you have the correct url when you click the login link? try to echo the $_GET['link'] and the $_SESSION['url']. If you have it right you may need to redirect with header('Location:'.$_SESSION['url']);. Otherwise check if you reset or destroy your session on wrong positions. — DaKirsche
– DaKirsche, Commented May 28, 2014 at 6:29
Try to print_r($_SERVER) to see what is the right variable for last page because on localhost it may not work as on a specific domain. — Romeo Onisim
– Romeo Onisim, Commented May 28, 2014 at 6:40

Mir Adnan · Accepted Answer · 2014-05-28 06:32:27Z

1

You don't really have to use session to achieve this. You can redirect the user based on $_SERVER['HTTP_REFERER']. This will tell you the last visited page. You can even add some filtration here as needed.

if($_SERVER['HTTP_REFERER']!='' && stripos($_SERVER['HTTP_REFERER'],'mydomain.com')!==false){
   header('location:'.$_SERVER['HTTP_REFERER']);
   exit;
}

answered May 28, 2014 at 6:32

Mir Adnan

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1 Comment

user3184286 Over a year ago

Hello $_SERVER['HTTP_REFERER'] give last visited page "mydomain.com/display.php?ID=781" but here i have like "mydomain.com/display.php?ID=781#about" so how to get this #about is menu tabs in that page like about,share,setting and all. depending on user select that need to be go.. please help me on this

Andrew · Accepted Answer · 2014-05-28 06:22:21Z

0

$_SESSION['url'] is not the same as $url

In your html, change <?php echo $url; ?> to <?php echo $_SESSION['url']; ?>

answered May 28, 2014 at 6:22

Andrew

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Comments

Jay-oh · Accepted Answer · 2017-08-24 14:12:00Z

Two pages required.First one is for calling (on-click) a session and other sets the value of session through ajax.

< a href="#" onclick="setsession()" style="color:#993b05"> Login </a>
<br/>
<script>
<br/>
function setsession(){<br/>
if (window.XMLHttpRequest)  <br/>
  {// code for IE7+, Firefox, Chrome, Opera, Safari<br/>
  xmlhttp=new XMLHttpRequest(); <br/> 
  }<br/>
else<br/>
  {// code for IE6, IE5<br/>
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");<br/>
  }<br/>
xmlhttp.onreadystatechange=function()<br/>
  {<br/>
  if (xmlhttp.readyState==4 && xmlhttp.status==200)<br/>
    {<br/>
    document.getElementById("scat").innerHTML=xmlhttp.responseText;<br/>
    }<br/>
  }<br/>
<br/>
xmlhttp.open("post","setsession.php",true);// calls a page  where u can set session <br/>
xmlhttp.send();<br/>
}<br/>
</script><br/>
if(isset($_GET['link']))<br/>
{<br/>
$_SESSION['url'] = $_GET['link'];<br/>
<br/>
}<br/>
header("Location:redirect.php");<br/>

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