CODEWITHSUNDEEP
phphttp-redirectquery-string
Simon Lenz
Simon Lenz

Reputation: 2812

php redirect with HTTP query string variables

atm I'm using the following four lines to redirect the user to another page on my website:

<?php
    header("Status: 301 Moved Permanently");
    header("Location: ./content/index.html");
    exit;
?>

but there is a problem with the use of HTTP query string variables like http://< url >?param=blah
they don't get appended to url understandably.

Is there a smart move for implementing this?

greetings

Upvotes: 53

Views: 104724

Answers (7)

jontro
jontro

Reputation: 10636

To do the redirect and make sure an extra question mark does not show up when query string is not passed use the following

function preserve_qs() {
    if (empty($_SERVER['QUERY_STRING']) && strpos($_SERVER['REQUEST_URI'], "?") === false) {
        return "";
    }
    return "?" . $_SERVER['QUERY_STRING'];
}
header("Status: 301 Moved Permanently");
header("Location: ./content/index.html" . preserve_qs());

Upvotes: 18

jave.web
jave.web

Reputation: 15052

I would like to add one more option...
Anyways - like others have said, using (.htaccess) mod_rewrite would probably be the best option.

However,
there surely can be many situations when you have to do it in PHP => you have 2 options:

  1. Append your redirection URI with $_SERVER['QUERY_STRING']
  2. Append your redirection URI with a query built on your own : http_build_query($_GET);

Option 2. - Advantages (+)

  • Encodes the parameters ( default by PHP_QUERY_RFC1738 )
  • you can easily add (or remove) some $_GET params like:
    $_GET['new_param']="new value"; (add)
    unset($_GET['param_to_remove']); (remove)
  • if environment (god knows why) does not provide a QUERY_STRING - you are probably still able to get the superglobal $_GET => environmentaly independent
  • http_build_query()'s 1st param can actually be ANY array or object so you can build a $_GET-like request from $_POST or $o = new YourObject(); if necessary
  • you can change argument separator if necessary

Option 2. - Dissadvantages (-)

  • this kind of building query might be redundant ("good-for-nothing"), just unnecessary...
  • if the query is big enaugh (maybe some attack?) it could have an affect on performace, because everytime there will be an array converted to a string & encoded

For more info see http://www.php.net/manual/en/function.http-build-query.php - a PHP manual's site about the http_build_query() function which Returns a URL-encoded string.

Upvotes: 10

regality
regality

Reputation: 6554

<?php
    header("Status: 301 Moved Permanently");
    header("Location:./content/index.html?". $_SERVER['QUERY_STRING']);
    exit;
?>

Upvotes: 106

dasrecht
dasrecht

Reputation: 450

I would also suggest to use mod_rewrite for this task, you can be more flexible.

Upvotes: 1

CrayonViolent
CrayonViolent

Reputation: 32537

First off why not redirect with mod rewrite?

But anyways, you can concat $_SERVER['QUERY_STRING'] to the end of your url

Upvotes: 2

eklundchristopher
eklundchristopher

Reputation: 159

Using $_SERVER['QUERY_STRING'] and appending it to the end of your redirect might be what you're looking for.

EDIT: Just noticed I was a bit late with my reply.

Upvotes: 4

Alec
Alec

Reputation: 9078

Add the $_SERVER['REQUEST_URI'] or QUERY_STRING. Do a print_r($_SERVER); to see more information about the requested URL.

Upvotes: 1

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