PHP 发送邮件不起作用，价值索引无法访问

Question

我用post和action方法来发送邮件。我尝试通过运行测试 PHP 从托管服务器发送短邮件。它正在工作。将其与 HTML 表单合并后不起作用，并且还会给出错误未定义的索引。这是代码的摘要。
HTML 文件：

     <form id="msform" action="./php/mailer.php" name="step1"  method="POST">      
    <fieldset>
        <h2 class="fs-title">Fillup basic Information</h2>
        <h3 class="fs=subtitle">This is step 1</h3><br>
        <input type="text" name="fname" placeholder="First Name" required/>
        <input type="text" name="lname" placeholder="Last Name" required/>
 <input type="button" name="next" class="next action-button"  value="Next" onclick="return validateStep1()"/>
     </fieldset>
    </from>

PHP 文件：

<?php
if(isset($_POST['next']))
{
$fname = $_POST['fname'];
$lname = $_POST['lname'];


  $msg="Hello My Name is $fname $lname . My Company is $company which is located in $address1 . The Second address is $address2. I live in $city city, $state state, $zip zip, $country.
  My Phone number is $tel. My Fax number is $fax. My email is $email. I want to donate $other. My Custom Donate is $otherDonation. I want to donate regular=$regulardonate for $dollar dollar
  per $months";

  mail("x@gmail.com","Donation",$msg);
}
?>

JS 文件：

function validateStep1()
{
  var fname =document.forms["step1"]["fname"];
  var lname =document.forms["step1"]["lname"];
if (fname.value == "")                                  
  { 
      window.alert("Please enter your first name."); 
      fname.focus();
      return false; 
  } 

  if (lname.value == "")                                  
  { 
      window.alert("Please enter your Last name."); 
      lname.focus(); 
      return false; 
  } 
    window.open('./second.html', '_self');
  return true;   
}

我在 GitHub 上的 Live 表单，你检查一下 - https://tamzid958.github.io/multipage_form/

Answer 1

您表单中的 PHP 文件不能作为 https://tamzid958.github.io/multipage_form/ 工作，因为主机根本没有解析 PHP。此托管仅适用于静态页面，例如 HTML、JS、CSS。

您需要将代码放在支持 PHP 的主机上。