PHP: Redirect ( header)

header("profil.php?id=" . $show["id"]);

开发者_开发知识库What i tried to do, but headers are already sent at top, so how can I redirect the user? Should I use window.location.replace("URL"); (javascript) instead?

If you can't control the very beginning of the script, where headers would be sent, then yes, your only method is to use JavaScript.

Also, the proper syntax is header('Location: profil.php?id=' . $show['id']);

You need the Location: part so the browser knows what header it's receiving. Also, don't forget to do an exit() or die() right after the redirect.

Someone correct me if i'm wrong, but I think you can use ob_start() at the beginning of your page and that will allow you to redirect via PHP even if headers are already sent.

You should redesign your application, to make it more sensible.
It should start output only when it necessary, not just every time this file is called.

You have to modify all your code by dividing every script to 2 parts. First part will contain all data manipulations and second will contain output only. It will be better to put the latter one into separate file, called template. thus your profiles php will looks like

include 'dbc.php';
//some code that sends headers, gets data etc
//after it's all done, call your template files
include 'top.php';
include 'profiles.tpl.php';
include 'bottom.php';

there can be some variations, but the main idea would be the same: separate your data manipulation from data presentation.

From the header documentation:

Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP. It is a very common error to read code with include(), or require(), functions, or another file access function, and have spaces or empty lines that are output before header() is called. The same problem exists when using a single PHP/HTML file.

The headers are being sent before your call to header() due to output from the script. You just need to track down where the output is coming from.

I see it that you have two options

1) You try to ensure that your headers are not set until after you have executed your code. Your headers being set before you have even determined what you are sending back to the user suggests your code is a little messy, or you are constrained in some way.

2) You can use your javascript solution. However, I would consider this as a hack, rather than an appropriate solution. Try to figure out the answer to why you can't use approach 1.

EDIT: A code example added

Your code should look something like this

<?php

// perform logic to determine if you need to do the redirect or not.
// if you do need to redirect, set the following 
$iNeedToRedirect = true;
// if you do not need to redirect, set the following
$iNeedToRedirect = false;

if ($iNeedToRedirect) {
   header("Location: profil.php?id=" . $show["id"]");
   die();
}

// if code gets here, carry on as normal
include("dbc.php");
include("top.php");

... etc etc etc
?>