Cometでサーバと双方向通信

stream.php

<?
  $file_name = "out.txt";
  $old_time = filemtime($file_name);
  $count = 0;

  if ($_POST["data"]) {
    $fp = fopen("in.txt", "w");
    if ($fp) {
      fputs($fp, $_POST["data"]);
      fclose($fp);
    }
  }

  while(1) {

    clearstatcache();
    $new_time = filemtime($file_name);

    if($old_time !== $new_time) {
      $data = file_get_contents($file_name);
      break;
    }

    $count ++;
    if ($count > 55) {
      echo "\n";
      flush();
      $count = 0;
    }

    sleep(1);
  }

  echo "\x7fdata=${data}";