i created two variable and these two variable are using everywhere . i don't want to store these variable in to database e.g ( $username ,$password and there are 3 files using these variable load.php,index.php and add.php , i am also using jquery to load the add.php as in ajax (to add the user in JSON)

$.ajax({ type: "POST", url: "add.php", data: "twitter="+encodeURIComponent(twitter), /* Sending the filled in twitter name */ success: function(msg){

        /* PHP returns 1 on success, and 0 on error */
        var status = parseInt(msg);
        if(status)
        {
            $('#response').html('Thank you ');
            $('#twitterName').val('');
        }
        else
        $('#response').html('<span style="color:red">There is no user.</span>');

    }
});

how can i use these two variable in a single file to perform the whole operation

Thanks