php get current domain

1// Warning: This can be manipulated by hackers!
2// If this is problematic, store the domain in a config file
3
4$currentDomain = $_SERVER['SERVER_NAME'];

1parse_url('http://www.website.com/hey.php', PHP_URL_HOST);

1$url = 'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html';
2$parse = parse_url($url);
3echo $parse['host']; // prints 'google.com'

1$_SERVER['REQUEST_URI']
2