Question

Is it possible to redirect to another page, say add.php with the request that were sent to the original page.

Say I have a file: form.html that has a post form
Now I submit this to form.php.

I want form.php to redirect the request to add.php so that add receives the same POST parameteres as form.php

this is done so that form.php can analyze a hidden field called action and depending on its value redirect to add.php or edit.php . I know this can be done in javascript by changing the form.action attribute. I am wondering if it is possible on server side

Answer 1

You can simply require_once inside a switch or if block.
If you really need actual redirection (i.e. you want the user to know where they were redirected to), you may need to send a ‘fake’ intermediate page, with an auto-submitting (via javascript) form full of hidden inputs.

The reason is right in the HTTP spec:

If the 302 status code is received in response to a request other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user, since this might change the conditions under which the request was issued.