PHP URL重定向 - 我这样做了吗？

Question

I want a link on my site to redirect like such...

http://mysite.com?url=1

$offer = $_GET['url'];

if ($offer == '1'){
  header("Location: http://site1.com");
}
if ($offer == '2'){
  header("Location: http://site2.com");
}

This is functional, but is there a better way to do this rather than having 50 if statements?

Answer 1

Assuming that your sites aren't really site1.com and site2.com (I'd be impressed if they were), this is probably a good way to approach the problem:

$sites = array(
    '1' => 'http://www.google.com/',
    '2' => 'http://www.bing.com/'
);

if (isset($sites[$_GET['url']])) {
    header('Location: ' . $sites[$_GET['url']]);
    die();
} else {
    die('Sorry, this does not exist.');
}

This would of course also allow you to do things such as accepting non-numeric values in ?url=.