PHP redirect to page with variable in URL

问题

I have a page, q.php, that is a user submitted post defined by its id, (for example, q.php?id=1 would be a certain post that uses the $id variable to pull all the rest of the information from the database).

I am trying to code a comment submission on the same page, and account for the fact that a user might not enter anything into the field. If this happens, I want the page (e.g. q.php?id=1) to load again with an error message.

I can do the error message with an empty variable that is then given a value by the php file that the form activates. However, I am having a problem navigating back to the specific post. I tried to use include('q.php?id=$id) where $id is set to a number, but I understand that this is not its purpose and it does not accept variables

What should I be using instead?

EDIT

answer.php (file that the form activates):

require 'q.php';
$_GET['id'] = $id;
$_SESSION['error'] = "Please fill in all of the fields.";

q.php:

if ($_SESSION['error'] !== 0) {
    echo "<p style='color: #AA1111;'>".$_SESSION['error']."</a>";
    unset($_SESSION['error']); // this isn't happening...
}

回答1:

If you really must include the page inline, you can always modify $_GET:

$_GET['id'] = $id;
require 'q.php';

But an error message sounds like it could be accomplished with a session variable or a redirect. A redirect could look something like:

header('Location: q.php?id=' . $id . '&error=The+error');
exit();

Then, you check for $_GET['error'] in q.php. Using a session variable for that would be much the same, except instead of adding error as a querystring parameter, you use $_SESSION['error'] and unset it immediately.

回答2:

You could use header("Location: q.php?id=$id"); exit;, but you would need some other way to send the error message (example: save it in $_SESSION)

You might be able to set the $_GET array how you want it - in this case, $_GET = Array("id"=>$id); then include("q.php"). This is generally considered haxy, though, and may result in problems if you don't use include_once properly.

来源：https://stackoverflow.com/questions/14007750/php-redirect-to-page-with-variable-in-url

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