HTML Form / PHP

我正在制作一个网站，并编码了一个表格供用户填写，然后该表格应通过电子邮件发送至john.doe@gmail.com.但是，当我将文件上传到服务器上，并用正确的详细信息测试表单时，它不起作用。html代码如下：

    <form class="form" name="htmlform" method="post" action="send2.php">
    <table width="540px">
    </tr>
    <tr>
     <td valign="top">
      <label for="name">Name *</label>
     </td>
     <td valign="top">
      <input  type="text" name="name" maxlength="70" size="30">
     </td>
    </tr>
    <tr>
     <td valign="top"">
      <label for="phone">Cell Phone *</label>
     </td>
     <td valign="top">
      <input  type="text" name="phone" maxlength="30" size="30">
     </td>
    </tr>
    <tr>
     <td valign="top">
      <label for="email">Email *</label>
     </td>
     <td valign="top">
      <input  type="text" name="email" maxlength="30" size="30">
     </td>
    </tr>
    <tr>
     <td colspan="2" style="text-align:center">
      <input type="submit" value="Submit">
     </td>
    </tr>
    </table>
    </form>

然后有一个名为"send2.php"的外部php文件，其中包含：

    $email_to = "john.doe@gmail.com";
    $email_subject = "Feedback Form";

    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }
    // validation expected data exists
    if(!isset($_POST['name']) ||
        !isset($_POST['phone']) ||
        !isset($_POST['email'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');       
    }
    $name = $_POST['name']; // required
    $phone = $_POST['phone']; // required
    $email_from = $_POST['email']; // required
    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+'.[A-Za-z]{2,4}$/';
  if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
    $string_exp = "/^[A-Za-z .'-]+$/";
  if(!preg_match($string_exp,$name)) {
    $error_message .= 'The Name you entered does not appear to be valid.<br />';
  }
    $cell_exp = "/^[0-9 .'-]+$/";
  if(!preg_match($cell_exp,$phone)) {
    $error_message .= 'The Last Name you entered does not appear to be valid.<br />';
  }
  if(strlen($error_message) > 0) {
    died($error_message);
  }
    $email_message = "Form details below.'n'n";
    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }
    $email_message .= "Name: ".clean_string($name)."'n";
    $email_message .= "Phone: ".clean_string($phone)."'n";
    $email_message .= "Email: ".clean_string($email_from)."'n";

// creating email headers
$headers = 'From: '.$email_from."'r'n".
'Reply-To: '.$email_from."'r'n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);  
?>
Thank you for contacting us. We will be in touch with you very soon.
<?php
}
die();
?>

有人能检查一下这个代码并告诉我哪里出错了吗。如有任何帮助，我们将不胜感激。

谢谢，WS