来自PHP表单的邮件

Question

我无法使用此代码从我网站的网页表单发送邮件 我的HTML代码如下：

<form  name="contactform" method="post" action="send_form_email.php" >    
    <label >Name<br />
        <input type="text" name="name"  required="required" />
    </label>
    <br/>
    <br />
    <label>E-Mail<br />`enter code here`
        <input type="email" name="email" required="required" />
    </label><br /><br />
    <label>Contact No.<br />
        <input type="text" name="telephone" required="required" />
    </label><br /><br />
    <label>Message<br />
        <textarea name="comments" ></textarea>
    </label><br /><br />
    <label>
        <input type="submit" name="name" value="Submit" id="submitbutton" />
    </label>
</form>

这是我的PHP代码。 PHP文件名是“send_form_email.php”，编写的代码如下所示。 -

<?php
if(isset($_POST['email'])) {

    // EDIT THE 2 LINES BELOW AS REQUIRED
    $email_to = "ABC@gmail.com";
    $email_subject = "Enquiry mail From Website";


    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['email']) ||
        !isset($_POST['telephone']) ||
        !isset($_POST['comments'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');       
    }

    $name = $_POST['name']; // required
    $email_from = $_POST['email']; // required
    $telephone = $_POST['telephone']; // not required
    $comments = $_POST['comments']; // 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 />';
  }
  $telephone_exp = "/^[0-9]{10}$/";
  if (!preg_match($telephone_exp,$telephone))  {
      $error_message .= 'The Number you entered does not appear to be valid.<br />';
  }

  if(strlen($comments) < 2) {
    $error_message .= 'The Comments you entered do not appear to be valid.<br />';
  }
  if(strlen($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";
    $email_message .= "Email: ".clean_string($email_from)."\n";
    $email_message .= "Telephone: ".clean_string($telephone)."\n";
    $email_message .= "Comments: ".clean_string($comments)."\n";


// create 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); 
?>