<?php    $prefix = ini_get('session.upload_progress.prefix');  $name   = ini_get('session.upload_progress.name');  $key    = $prefix . $name;  session_start();    if (isset($_POST['get_info'])) {      $logo = $prefix . $_POST['logo'];      exit(json_encode($_SESSION[$logo]));  } elseif ($_POST) {      echo '<script>var finashed = true;</script>';  }    ?>    <div id="show_info_div"></div>  <form action="index.php" method="POST" enctype="multipart/form-data">      <input type="hidden" name="<?php echo $name; ?>" value="test">      <input type="file" name="file"><br>      <input type="submit" value="提交">      <input type="button" value="获取信息" onclick="getUploadInfo()">  </form>    <script src="jquery.js"></script>  <script>  var sto = null;  var progress = null;  function getUploadInfo()  {      $.post("index.php", {"get_info": 1, "logo": "test"}, function(data)      {          data = eval("(" + data + ")");            progress = parseInt(parseInt(data.bytes_processed) * 10000 / parseInt(data.content_length)) / 100 + "%";          document.getElementById("show_info_div").innerHTML = progress;          sto = setTimeout("getUploadInfo()", 1000);      });  }    if (typeof(finashed) !== "undefined")  {      document.getElementById("show_info_div").innerHTML = "100.00% (上传成功！)";  }  </script>