.html 表单信息无法通过 .php 提交到电子邮件

Question

我创建了一个 html 表单，旨在做两件事 - 将表单信息提交到指定的电子邮件地址，并将用户重定向到网站上的另一个页面。我创建了一个 .php 表单来管理这些操作。表单成功重定向并发送了一封电子邮件。然而，该电子邮件具有正确的目的地、主题和消息，但未能提取用户提交给表单的信息——即姓名、地址、电子邮件等。

我对网络开发完全陌生，但希望您能提供任何见解。谢谢！

HTML:

<section>
   <div class="row">

<div class="col-lg-offset-3 col-lg-6 col-md-12"><form name="Whitepaper 
Request form" method="POST" action="Info-Request.php" class="text-center">

<input name="First_Name" type="text" required class="contact-field-sm" 
id="fname" placeholder="First Name">

<input name="Last_Name" type="text" required class="contact-field-sm" 
id="lname" placeholder="Last Name"><br><br>

<input name="Address" type="text" class="contact-field-sm" id="address" 
placeholder="Address">

<input name="City" type="text" class="contact-field-sm" id="city" 
placeholder="City"><br><br>

<input name="State" type="text" class="contact-field-sm" id="state" 
placeholder="State">

<input name="Zip" type="text" class="contact-field-sm" id="zip" 
placeholder="Zip"><br><br>

<input name="Phone" type="tel" class="contact-field-sm" id="phone" 
placeholder="Phone">

<input name="Email" type="email" class="contact-field-sm" id="email" 
placeholder="Email"><br><br>

<input name="Company" type="text" required class="contact-field-sm" 
id="company" placeholder="Company">

<input name="Title" type="text" required class="contact-field-sm" id="title" 
placeholder="Title"><br><br>

<input id="submit" type="submit" value="Submit"> 
</form>

PHP:

<?php
if(!isset($_POST['submit']))

$to = "email@example.com";
$from = 'Whitepaper Request Form';
$email_subject = " ";
$email_message = "Results from Whitepaper Request Form:\n\n";

    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
     }

 $First_Name = $_POST['First_Name'];
 $Last_Name = $_POST['Last_Name'];

    $email_message .= "First Name: ".clean_string($First_Name)."\n";
    $email_message .= "Last Name: ".clean_string($Last_Name)."\n";
    $email_message .= "Address: ".clean_string($Address)."\n";
    $email_message .= "City: ".clean_string($City)."\n";
    $email_message .= "State: ".clean_string($State)."\n";
    $email_message .= "Zip: ".clean_string($Zip)."\n";
    $email_message .= "Phone: ".clean_string($Phone)."\n";
    $email_message .= "Email: ".clean_string($Email)."\n";
    $email_message .= "Company: ".clean_string($Company)."\n";
    $email_message .= "Title: ".clean_string($Title)."\n";

 mail($to,$from,$email_subject,$email_message);
 header('Location: Example_Retro_WhtP.pdf');
 ?>

[已编辑] PHP：

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

 $to = 'example@example.com';
 $subject = 'Whitepaper Request Form';
 $email_message = 'Results from Whitepaper Request Form:\n\n';
 $headers = 'From: example@example.com';

    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
      }

   $email_message .= "First Name: ".clean_string($_POST['First_Name'])."\n";
    $email_message .= "Last Name: ".clean_string($Last_Name)."\n";
    $email_message .= "Address: ".clean_string($Address)."\n";
    $email_message .= "City: ".clean_string($City)."\n";
    $email_message .= "State: ".clean_string($State)."\n";
    $email_message .= "Zip: ".clean_string($Zip)."\n";
    $email_message .= "Phone: ".clean_string($Phone)."\n";
    $email_message .= "Email: ".clean_string($Email)."\n";
    $email_message .= "Company: ".clean_string($Company)."\n";
    $email_message .= "Title: ".clean_string($Title)."\n";

 mail($to,$subject,$email_message,$headers);
 header('Location: Example_Retro_WhtP.pdf');
     exit;
 }
 ?>

Answer 1

（主要）问题出在下面使用的参数上，还有一些其他问题。

mail($to,$from,$email_subject,$email_message);

PHP mail() 的语法如下，顺序如下：

$to = "To the recipient".
$subject = "The mail's subject".
$email_message = "The mail content".
$headers = "That's where you put the From: email@example.com"。（需要添加但不存在）。

根据手册的语法：

bool mail ( string $to , string $subject , string $message [, string $additional_headers [, string $additional_parameters ]] )

http://php.net/manual/en/function.mail.php

遵循该语法，邮件将包含用于发送邮件的所有内容。

注意：您将需要添加其他输入缺少的 POST 数组。

但是，您声明电子邮件已发送。在看到以下情况：

if(!isset($_POST['submit']))

这就是您的代码发送邮件的原因，因为没有带有该名称的提交输入，因此它永远不会 "set"。

<input id="submit" type="submit" value="Submit">

应读作：

<input id="submit" type="submit" name="submit" value="Submit">

并使用适当的支撑技术。

即：注意，我删除了 ! 运算符，这意味着 "not":

if(isset($_POST['submit'])){

    // run your code in here to be executed

}

同时添加 else{...} 条件。

同时使用 PHP 的错误报告检查错误：

http://php.net/manual/en/function.error-reporting.php

在 header 之后添加一个 exit; 也没有坏处，甚至建议防止进一步执行（如果下面有更多代码）。

还最好使用 empty() 和 isset() 检查空字段。

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