php为链接页面保留相同的查询

I have the following situation. Whenever the URL of a current page of my site looks like this: http://thisismysite.net/example.php?no_redirect=true I need all the pages my users visit from there to automatically add the "?no_redirect=true" part at the very end of the URL in order to execute the query but I got no clear idea on how to do it.

For example, on example.php I have the following links to other pages within my site.

-about.php -contact.php

If you click on those, you are redirected to about.php and contact.php respectively. However, if instead of example.php we have example.php?no_redirect=true on the address bar you should be redirected to about.php?no_redirect=true and contact.php?no_redirect=true respectively.

I tried with a referrer like this:

if (strpos($_SERVER['HTTP_REFERER'],'true') == false) { 
  $_GET['no_redirect']="true";
}

it didnt work. Whats the best way to achieve this?

Thank you.

Solution 1: I would recommend to save the no_redirect variable(true/false) on $_SESSION when the user requests the example.php page.

Than on other pages, check the $_SESSION variable instead of the $_GET variable.

Solution 2: You could generate a variable based on the $_GET parameter, something like this:

$no_redirect_param = "";

if(isset($_GET['no_redirect']) && $_GET['no_redirect'] == "true"){
    $no_redirect_param = "?no_redirect=true";
}

and than include this variable at the end of each link:

<a href="about.php<?php echo $no_redirect_param; ?>">About</a>