WordPress: How can use $_SESSION in wordpress - php

Question

I have this code to select user country like this :-
<form method="post" action="" enctype="multipart/form-data">
<select name="countryname" onchange="this.form.submit()">
<option value="">Select Country</option>
<option value="AF">Afghanistan</option>
<option value="AX">Åland Islands</option>
<option value="AL">Albania</option>
<option value="DZ">Algeria</option>
<option value="AS">American Samoa</option>
<option value="AD">Andorra</option>
<option value="AO">Angola</option>
<select>
Now I need to save the countryname in $_SESSION to use it in all my site page.
How can try this way in wordpress.
I f not support, How can set the page URL when select country to convert URL from
www.domain.com/
To
www.domain.com/?country=AD
To get it in $_GET value.

Answer 1

Please Try this
in your page at the top you can start the session :-
session_start();
after that here you have a form with method POST.
So,whatever value get in name="countryname" take this in Post method
like this:-
$country = $_POST['countryname'];
now your selected value store in $country ok.
after take this value in session like this:-
$_SESSION['country'] = $country
after that for check if in session value store or not
echo $_SESSION['country'];
and you get value in session

Answer 2

Krunal Trivedi was right. You need on select organize the ajax call and post the countryname. On server side you should take var from post and store at session
<form method="post" action="" enctype="multipart/form-data">
<select name="countryname" onchange="saveCountryCode()">
<option value="">Select Country</option>
<option value="AF">Afghanistan</option>
<option value="AX">Åland Islands</option>
<option value="AL">Albania</option>
<option value="DZ">Algeria</option>
<option value="AS">American Samoa</option>
<option value="AD">Andorra</option>
<option value="AO">Angola</option>
<select>
jQuery Code:
function saveCountryCode(){
var selectedCountry = $('input[name="countryname"]').find(':selected').val();
$.ajax({
type: "POST",
url: "ajax/countrySaver.php",
data: { countryname: selectedCountry }
}).done(function( result ) {
alert(result);
});
}
countrySaver.php
<?php
session_start();
$_SESSION['countryname'] = $_POST['countryname'];
echo $_SESSION['countryname']
?>