session_start(); include 'conn.php'; $counter = intval(file_get_contents("counter.dat")); if(!isset($_SESSION['visitor'])){ $counter++; $fp = fopen("counter.dat", "w"); flock($fp, LOCK_EX); // do an exclusive lock fwrite($fp, $counter); flock($fp, LOCK_UN); // release the lock fclose($fp); session_register('visitor'); $_SESSION['visitor'] = 'true'; } //echo $counter; $counter = substr('000000' . $counter,-6); ?>