Ask question ajax and PHP SESSION variable

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hello all i've a problem with php session variables; in fact the issue is about a session variable that i've created in a php file and can't be accessed in another one requested by ajax.

below is the code of ajax.html the page from witch an ajax request is sent :

console.log('JQuery Ready')
     $.get(

        'http://localhost/php_files/ajax.php',
        false,

        function(data,status){


        console.log('data is'+data+' '+'status is ' +status);


        },
       'text'
        );

Next the Page Request ajax.php

if(isset($_SESSION['ses'])) echo 'session working';
else echo ' session not working';

And Finally the file Where i 've created the session variable :

session_start();

$_SESSION['ses']='session';
 echo $_SESSION['ses'];

what should i do to fix this problem ?

What I have tried:

i've tried to send data with ajax to a php page