提交表单时，浏览器加载php文件，该文件包含处理表单的代码 - On form submission the browser loads the php file that had the code for handling the form

On form submission the browser loads the php file that had the code for handling the form

我正在写我的第一个php代码。。。我正在尝试提交表格。
我有两个php文件。index.php（包含表单）和process.php（包含处理表单的方法）
但在提交表单时，浏览器会转到process.php，因此不会显示任何内容。我正试图在index.php.中呼应这个结果

请记住，这是我的第一个php代码…：-）

这是index.php

<!DOCTYPE html>
<html>
<?php
  include 'process.php';
  $newletter1 = new newsletter();
?>
  <head>
    <meta charset="utf-8">
  <title></title>
  </head>
  <body>
    <form action="process.php" method="post">
      <input type="text" name="email" placeholder="Your Email Address..."><br><br>
      <input type="submit">
    </form>
    <h4><?php $newletter1 -> abc(); ?></h4>
  </body>
  </html>

这是process.php

class newsletter
{
  public function abc()
  {
    if (isset($_POST["email"])) {
      $input = $_POST["email"];
      if (empty($input)) {
        echo "Please provide an email address!";
      }else{
        echo "Thanks for subscribing " . $input;
      }
    }else{
      echo "ELSE is running...";
    }
  }
}

您的脚本process.php只是一个类定义。

一个类什么都不做，除非它被实例化并调用了一个方法。

当您在index.php中包含它并实例化它时，我建议更改<form>标记，使其自己运行，让href=""来执行此操作。

<?php
  // run this only if we are being set info by the user
  // so not when the form is first loaded.
  $to_show_later = '';
  if ($_SERVER['REQUEST_METHOD'] == 'POST' ) {
      include 'process.php';
      $newletter1 = new newsletter();
      $to_show_later = $newsletter1->abc();
  }
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
    <form action="" method="post">
      <input type="text" name="email" placeholder="Your Email Address..."><br><br>
      <input type="submit">
    </form>
    <h4><?php echo $to_show_later; ?></h4>
</body>
</html>

直接从类方法中回显也是一种不好的做法，因此请更改此项，使其返回数据。

class newsletter
{
  public function abc()
  {
    $reply = '';
    if (isset($_POST["email"])) {
      $input = $_POST["email"];
      if (empty($input)) {
        $reply = "Please provide an email address!";
      }else{
        $reply = "Thanks for subscribing " . $input;
      }
    }else{
      $reply = "ELSE is running...";
    }
    return $reply;
  }
}

在您的进程中。php将其替换为：

if (isset($_POST["email"])) {
      $input = $_POST["email"];
      if (empty($input)) {
        echo "Please provide an email address!";
      }else{
        echo "Thanks for subscribing " . $input;
      }
    }else{
      echo "ELSE is running...";
    }

它会起作用，并且您不必包含process.php来提交仅表单