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有人能告诉我如何让这个脚本在开始上传过程之前而不是在文件上传之后检查密码吗？我需要上传的一些文件很大，等到文件上传到它告诉我密码错误之前，这很糟糕。

感谢您的任何帮助，您可以提供。

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
    <head>
      <title>ES Simple Uploader</title>
      <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
      <meta name="generator" content="handmade" />
        <style type="text/css">
        <!--
            body {
                font-family: Arial, Helvetica, sans-serif;
                font-size: 14px;
                background-color: #DDDDDD;
            }
            .cnt {
                text-align: center;
            }
            .cnt_welcome {
                font-size: 16px;
                font-weight: bold;
                text-align: center;
            }
            .cnt_powered {
                font-size: 14px;
                font-weight: bold;
                text-align: center;
            }
            .cnt_small {
                font-size: 12px;
                text-align: center;
                padding-top: 50px;
            }
            .head_line {
                background-color: #BBBBBB;
            }
            .main_table {
                border: solid 1px #9D9992;
                font-size: 13px;
            }
            h4 {
                font-size: 12px;
                color: #DD0000;
                text-align: center;
            }
            .button {
                border: 1px solid #55555;
                font-weight: bold;
            }
    -->
    </style>
    </head>

    <body>
    <?
    include("config.php");

    function path_options()
    {
     global $upload_dirs;
      $option = "";
      foreach ($upload_dirs as $path => $pinfo)
      {
        $option .= '<option value="'.$path.'">'.$pinfo["name"].'</option>';
      }
     return $option;
    }

    function check_vals()
    {
     global $upload_dirs, $err;
        if (!ini_get("file_uploads")) { $err .= "HTTP file uploading is blocked in php configuration file (php.ini). Please, contact to server administrator."; return 0; }
        $pos = strpos(ini_get("disable_functions"), "move_uploaded_file");
        if ($pos !== false) { $err .= "PHP function move_uploaded_file is blocked in php configuration file (php.ini). Please, contact to server administrator."; return 0; }
      if (!isset($_POST["path"]) || (strlen($_POST["path"]) == 0)) { $err .= "Please fill out path"; return 0; }
      if (!isset($upload_dirs[$_POST["path"]])) { $err .= "Incorrect path"; return 0; }
      if (!isset($_POST["pwd"]) || (strlen($_POST["pwd"]) == 0)) { $err .= "Please fill out password"; return 0; }
      elseif ($_POST["pwd"] != $upload_dirs[$_POST["path"]]["password"]) { $err .= "The upload password is incorrect"; return 0; }
      if (!isset($_FILES["userfile"])) { $err .= "Empty file"; return 0; }
      elseif (!is_uploaded_file($_FILES['userfile']['tmp_name'])) { $err .= "Empty file"; return 0; }
     return 1;
    }

    $err = ""; $status = 0;
    if (isset($_POST["upload"])) {
      if (check_vals()) {
        if (filesize($_FILES["userfile"]["tmp_name"]) > $max_file_size) $err .= "Maximum file size limit: $max_file_size bytes";
        else {
          if (move_uploaded_file($_FILES["userfile"]["tmp_name"], $upload_dirs[$_POST["path"]]["dir"].$_FILES["userfile"]["name"])) {
                    $status = 1;
                }
          else $err .= "There are some errors!";
        }
      }
    }

    if (!$status) {
      if (strlen($err) > 0) echo "<h4>$err</h4>";
    }
    else {
      echo "<h4>&quot;".$_FILES["userfile"]["name"]."&quot; was successfully uploaded.</h4>";
    }
    ?>
    <p class="cnt_welcome">Welcome to ES Simple Uploader v 1.1.</p>
    <p class="cnt">&laquo; <a href="http://www.energyscripts.com/Products/product2.html">Back to Product page</a> &laquo;</p>
    <p class="cnt">(Select folder, set it's password, then select a file to upload and click "Upload" button).
        <br />Note: 
            Folder: &quot;Images folder&quot;, Password: &quot;images&quot;;
            Folder: &quot;Docs&quot;, Password: &quot;docs&quot;;
            Folder: &quot;Common files&quot;, Password: &quot;common&quot;;
            Maximum file size: <?=$max_file_size/1024?> Kb.</p><br />
    <form enctype="multipart/form-data" action="index.php" method="POST">
    <input type="hidden" name="MAX_FILE_SIZE" value="<?=$max_file_size?>" />
    <table class="main_table" align="center">
      <tr>
        <td colspan="2" class="head_line">&nbsp;</td>
      </tr>
      <tr>
        <td>Folder:</td>
        <td><select name="path"><?=path_options()?></select></td>
      </tr>
      <tr>
        <td>Password:</td>
        <td><input type="password" name="pwd" style="width: 217px;" /></td>
      </tr>
      <tr>
        <td>Choose file:</td>
        <td><input type="file" name="userfile" style="width: 222px;" /></td>
      </tr>
      <tr>
        <td colspan="2" align="right"><input type="submit" name="upload" value="Upload" class="button" /></td>
      </tr>
    </table>
    </form>
    </p>
    <p class="cnt_powered">Powered by <a href="http://www.energyscripts.com" target="_blank">EnergyScripts</a></p>
    <p class="cnt_small">Find more power solution: <a href="http://www.energyscripts.com/Products/product1.html" target="_blank">ES File Upload &amp; Download Manager</a></p>
    </body>
    </html>
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