View file modile/user/bal_n.php

<?php
if ($user_b == '') $user_b = $_SESSION['user_login'];

$balans = trim(file_get_contents($cms.'user/'.$user_b.'/balans.txt'));
$balans = $balans+$bal;
$fp_bal = fopen ($cms.'user/'.$user_b.'/balans.txt', "w+");
fwrite ($fp_bal, $balans);
fclose ($fp_bal);
?>