HTML 表单使用 PHP 将内容提交到.txt文件 - 空白

Question

>我创建了一个HTML表单，该表单应该使用PHP将输入的文本提交到.txt文件中，但它只创建了一个空行，我不知道问题是什么。

非常感谢帮助！

<form class="form-inline validate" name="form1" method="post" action="signup.php" target="_blank" novalidate>
    <div class="row no-gutter">
        <div class="col-sm-9">
            <input type="email" value="" name="mail" class="form-control" placeholder="Subscribe to our newsletter" required>
        </div>
        <div class="col-sm-3">
            <input type="submit" value="SUBSCRIBE" name="Submit">
        </div>
    </div>
</form>
<?php
$username = $_POST['user'];
//the data
$data = "$emailn";
//open the file and choose the mode
$fh = fopen("users.txt", "a");
fwrite($fh, $data);
//close the file
fclose($fh);
print "User Submitted";
?>

Answer 1

如果你想接收邮件，请将你的php代码更改为

   <?php
    if(isset($_POST['Submit'])){
       $email = $_POST['mail'];
      //the data
      $data = "$emailn";
      //open the file and choose the mode
      $fh = fopen("users.txt", "a+");
      fwrite($fh, $data);
      //close the file
      fclose($fh);
      print "User Submitted";
    }
    ?>