当表单具有 enctype="text/plain" 时无法从 $_POST 数组获取字段

Question

我相信我的代码是正确的，当我删除 isset 语句时它 returns 一个错误，就好像没有设置字段一样。我听说这可能是由于 PHP 在服务器上的配置方式所致，可能是这种情况。变量似乎没有从 HTML 传递到 PHP 代码。如果这意味着什么，我在 windows 服务器 2016

上安装了 PHP WebPlatformInstaller 和运行 IIS

<?php
echo "test";

    if(isset($_POST['email'])) {
        echo "success";
        $email_to = "temp@gmail.com";
        $email_subject = "Your email subject line";

        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($_POST['email']) ||
            !isset($_POST['message'])) {
            died('You must enter your email and a message');       
        }


        $email_from = $_POST['email']; // required
        $message = $_POST['message']; // 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(strlen($message) < 2) {
        $error_message .= 'The message 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);
        }

        $email_message .= "Email: ".clean_string($email_from)."\n";
        $email_message .= "message: ".clean_string($message)."\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);  
        ?>

        <!-- include your own success html here -->

        echo "Thank you for reaching out! I'll be in touch.";

        <?php

        }
        ?>`

HTML

<form action="contact.php" method="post" enctype="text/plain">
      <input type="email" placeholder="Email" name='email' required>
      <input class="btn" type='submit' tabindex="1" value='Send'>
      <textarea type='text' name='message' required></textarea>
    </form>

Answer 1

为什么使用 enctype="text/plain" ??

HTML表单提供三种编码方式：

application/x-www-form-urlencoded (the default)
multipart/form-data
text/plain   (Never use)

当您编写客户端代码时，您只需要知道当您的表单包含任何 <input type=""> 元素时使用 multipart/form-data。

Answer 2

读这个：Bug #33741 $_POST superglobal not populated 这是关于你的问题。

并在那里回答：

Valid values for enctype in tag are:

application/x-www-form-urlencoded

multipart/form-data

使用代码示例查看这些屏幕截图以查看结果：

text/plain

application/x-www-form-urlencoded

额外：php://输入流

作为请求正文，它除了 @ 符号外什么都没有改变（这就是为什么它是 urlencoded）

结果：这不是 PHP 的错误，它是所有 PHP 版本接受支持的 enctypes 的共同特征，它只是不填充 $_POST 数组从 php://input 到 "see" 不同的内容类型。但是如果你坚持你可以从 php://input 流中读取它。

link to manual

当表单具有 enctype="text/plain" 时无法从 $_POST 数组获取字段

Cannot get field from $_POST array when form has enctype="text/plain"

html

php

forms

email

enctype