PHP Header Redirect not working when used with "www"

Question

I'm using this but whenever i try to open with www, it gives me an error:

if($_SERVER['HTTP_HOST'] == "sub.mydomain.com")
header("Location: mydomain.com/sub/");

Where am I going wrong?

I want users redirected when they type sub.mydomain.com or www.sub.mydomain.com

`if (strpos('sub.mydomain.com', $_SERVER['HTTP_HOST']) !== false)` — u_mulder, Nov 30 '14 at 18:35
What error? The Location: header is supposed to carry an URL (that includes `http://`), not an browser address bar string. — mario, Nov 30 '14 at 18:35
Do this on a higher level with apache or nginx. You can wildcard your subdomain and have the web server redirect all requests to root. — davidxd33, Nov 30 '14 at 18:36
@davidxd33 That is only possible if op has access to the server. he/she may not have that! — Philip G, Nov 30 '14 at 18:44

score 1 · Accepted Answer · edited May 23 '17 at 11:58

1

You need to do a correct header call.

Like this:

if(strpos('sub.example.com', $_SERVER['HTTP_HOST']) !== false){
    header("location: http://example.com/sub/");
}

EDIT: Based on the information in this post: You can also use this function instead:

function get_subdomain($url=""){
    if($url==""){
        $url = $_SERVER['HTTP_HOST'];
    }
    $parsedUrl = parse_url($url);
    $host = explode('.', $parsedUrl['path']);
    $subdomains = array_slice($host, 0, count($host) - 2 );
    return implode(".", $subdomains);
}

if('sub' != get_subdomain()){
      header("location: http://example.com/sub/");
}

edited May 23 '17 at 11:58

Community

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answered Nov 30 '14 at 18:41

Philip G

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I tried this and the website went down! :( And why would anyone give a negative rating?!! I coulnd't find any online tutorial and hence posted here – user3362364 Nov 30 '14 at 19:00
This is the way to do it, Then you probably have an error in your code somewhare – Philip G Nov 30 '14 at 19:02
I just copied pasted it and changed the domain name. Twice!! I'll look into it again shortly after dinner. Thank You :) – user3362364 Nov 30 '14 at 19:08
You could try this edited code. If it doesn't work there probably is some other error in your code! – Philip G Nov 30 '14 at 19:15
I have tried both of these examples and they ARE working. So as i've said earlier, your problem derives from somewhere else! – Philip G Nov 30 '14 at 19:36
The main problem was that i didn't create another subdomain with www. I'm using aws amazon. Thank you so much :) – user3362364 Dec 11 '14 at 10:31

PHP Header Redirect not working when used with "www"

1 Answers1