传递隐藏变量没有形式和使用PHP中的链接

Question

I want to know how to pass a (or couple) variable from one page to another in php without any form and by using a link.

I know that session is the best option but how to I implement it in the following scenario:

Delete -> process.php Add -> process.php (same page like above)

I want to pass a hidden variable that tells me what link is clicked and hence what function to call. Is there anyway not use $_GET and use sessions?!

Thanks,

Answer 1

All HTTP requests are independent of one another. Data that you have access to includes:

1. Variables passed through the URL ($_GET)
2. Variables posted through a form ($_POST)
3. Cookies
4. Session data

Since you are opposed to using a $_GET request, and both links go to the same page, you will need some other way to determine which link is clicked. I would recommend using a form, and passing the data through a hidden input type.

Example:

<form action='process.php' method='post'>
   <input type='hidden' name='action' value='add' />
   <button onClick='submit();'>
      Add
   </button>
</form>

<form action='process.php' method='post'>
   <input type='hidden' name='action' value='delete' />
   <button onClick='submit();'>
      Delete
   </button>
</form>

<style type='text/css'>
button {
   background:none!important;
   border:none; 
   padding:0!important;
   border-bottom:1px solid #444; 
   cursor: pointer;
}
</style>

In your process.php script, you will then check against $_POST['action'] to see if it's equal to "add" or "delete". The style tag I added is something I found from SO user adardesign (*) on how to style a button like a link.

EDIT: To answer your question on whether or not you can use sessions to accomplish this, I would say that it's possible, but probably not worth it.

I would probably never decide to go this route, but what you could do is have an AJAX request which gets triggered when the user clicks one of those links. The AJAX request would call a PHP script which sets the session equal to "add" or "delete". In your success callback, you would then redirect the user to the process.php page, where you then be able to check the value of your $_SESSION variable. Again, it's probably not worth doing it this way, but it is possible.

• CSS Source: How to make button look like a link?