Refresh SESSION after change it by submit form

Question

I have code that get me country flag for user when select country from drop down menu like this

Submit country:

<select name="countryname" onchange="this.form.submit();fla(this);" >
    <option value="AF">Afghanistan</option>
    <option value="US">USA</option>
    <option value="UK">UK</option>
</select>

After change above we do this:

define('WCDP_PATH_INCLUDES', dirname(__FILE__) . '/inc');

if (!class_exists('GeoIP')) {
    include(WCDP_PATH_INCLUDES . "/geoip.inc");
}
$geo_data = geoip_open(WCDP_PATH_INCLUDES . "/GeoIP.dat", GEOIP_STANDARD);

$country_code = geoip_country_code_by_addr($geo_data, $_SERVER['REMOTE_ADDR']);

$countrynameselect =  $_SESSION['countryname'];

if ($countrynameselect) {
    $country_code = $countrynameselect;
} else {
    $country_code = geoip_country_code_by_addr($geo_data, $_SERVER['REMOTE_ADDR']);
}       
// Build HTML for flag icons.
?>

<img src="<? bloginfo('stylesheet_directory')?>/flags/sm/<?php echo strtolower($country_code).'.png'; ?>" border="0" style="margin-top:10px" id="flagc" />

Now when user select country from drop down menu, I save country post in SESSION , But when user change again, it does not update SESSION , and to update it, we must refresh page to show new SESSION value.

What can I do ??

Answer 1

You can try unset the session and set the session again when a user selects something else.

How are you setting the session? does the user click submit and then the session is set? or are you using AJAX?