If you output a location header then I don't know what the browser will do with text sent after that. Hopefully nothing!
Be carefull to exit() php code after header-location (and some text, see below): otherwise code following will be executed! It's a common error.
> I experienced some strange behaviour(=no redirect at all!!) with a > script that send data after the location header.
> header("Location: http://somesite.nl";);
> die();To make things work, just follow the HTTP/1.1 spec[1]:
PHP just sends a "302 Found" code in the http header when using
PHP header("Location: ..."). It's a 'temporary' redirect (browser
should continue to use previous url), as opposed to a 'permanent'
redirect (http code 301). Text sent after that fills the body
of the http request (ex GET), and it shoud
"contain a short hypertext note with a hyperlink to the new URI(s)."
(unless request is HEAD) [2]. Also note that the location url
must be absolute, not relative [3].So use
1. header("Location: $url"); // $url must be absolute
2. echo "...<a href='$url'>...</a>..."; // send body of request
3. exit() or die(); // to avoid executing of code followingForgetting 1 is common error: not all browser will 'redirect' then, but most modern browsers do, helping uncompliant applications.
Forgetting 2 makes impossible to see the redirected page with old browsers (they only display the body of 30x request, allowing user to manually follow it.. I vaguely remember netscape 2 or 3).
Forgetting 3 causes bugs, sometimes hard to find.
Note that things can be different with POST requests.
"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." [4]
The curious about redirects will read 302 and 301 codes, but also 303 and 307 (only since http/1.1)
[1] http/1.1 RFC (w3c html version) http://www.w3.org/Protocols/rfc2616/rfc2616.html [2] 302 http code http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.3 [3] Location http header http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.30
Christophe
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