$ _SESSION变量用于检查表单是否已提交

Question

I have a landing page called `index.php' with the following form:

<form action="auto_mail.php" method="post">
   <input id="signup" class="span8" type="text" placeholder="Your email" name="signup">
   <input type="submit">
   <?php
     if (isset($_SESSION['got_it']))
     {echo "<b>You're all signed up!</b>}
   ?></form>

In the file auto_mail.php I have:

// code scrubbing user input...
$user_email = $_POST['signup'];
session_start();
$_SESSION['got_it'] = '1';
// code sending me an email when someone signs up.
echo <<<EOD
  </b>
  <meta http-equiv="refresh" content="0, url=index.php">
  </div>
  </body>
  </html>
EOD;
?>

I've looked at some other SO questions (Using $_SESSION to carry data), but it's not what I'm looking for.

All I want, is for a user to see "You're all signed up" when they enter a valid email; with the email confirm email being sent in the background. This code feels clumsy and awkward. It also flashes the auto_mail.php page briefly.

I tried to set <form action="index.php"..., but it doesn't work because I've set up auto_mail.php such that you can't access it directly.

How can use the code in auto_mail.php, which checks for a valid email address and sends confirm emails, without dealing with both $_POST and $_SESSION, or at least using them better?

Answer 1

If you don't want to have any page reloads whatsoever, you'll have to use AJAX to send the form, instead of utilising the form POST.

If you are using jQuery, or Mootools, they both have built in wrappers to handle ajax calls. Without a helper library, you'll have to look into making an XMLHttpRequest yourself.

Other than that, traditionally, you would redirect the user to a "form submitted" page, or alternatively, have the form action be sent to the same page (in your case, index.php, and have PHP code to handle form data if it is received).