Need Help with Session Varibales

Guys, I need to show Country Specific ads to the users of my website. This works well intially when i am able to get the users Ip address and get the Country Code and set a session variable to that country and use that variable to show ads for that country.

But I also have flags (links) on my website for each country the user could go to and browse that countrys items. How do i reset the session variable at that time to the exact flag that the user has clicked.

Here is what i have until now

  <?php
// index.php

session_start();
require_once('ip.php');
//this variable below is set in ip. php
$_SESSION['country'] = based on the users country;

//then somewhere in the index.php i have images with href
<a href="index.php" target="_self"><img src="images/UK.png" />UK</a>

// how do i reset the $_SESSION['country'] = based on what the user has selected;

PHP:

 

You could set two session variables
user_country
selected_country

So when a user clicks on the different flag, set the session variable for selected country.

Now when you display ads, make a if else statement

if (isset($_SESSION['selected_country']) && ($_SESSION['selected_country']!='') ) {
// Show this country ads
} else {
// User Country ads
}

 

See the post above (removed mine, above has more info)

 

thank you mac83 thank makes sense the only problem now i have is how to set the session variable on the click of the hyperlink, if a sample code is provided that will be good.

 

Your Link:

echo '<a href="'.$_SERVER['PHP_SELF'].'?selected_country=UK" target="_self"><img src="images/UK.png" />UK</a>'

PHP:

On the top of the page:

if ( isset($_GET['selected_country'])&&($_GET[$_GET['selected_country']]!='') ) {
 $_SESSION['selected_country'] = $_GET['selected_country'];
}

PHP:

 

thank you very much.
Rep added.