<?php
$fname = './balance.txt';
    function balance()
        {
            global $fname;
            if(!file_exists($fname)) { $h = @fopen($fname, 'w+'); flock($h, 2); fwrite($h, '1', 1); flock($h, 3); fclose($h); $val = 1; }
            else
                {
                    $val = @file_get_contents($fname);
                        $server = 's'.$val.'.odpal.com';
                    $val++;
                    if($val == 6) $val = 1;
                    $h = @fopen($fname, 'w+'); flock($h, 2); fwrite($h, $val, strlen($val)); flock($h, 3); fclose($h);
                }
            return $server;
        }

        echo balance();
?>