CodeIgniter - Supporting Multiple Domains in config["base_url"]

A very quick blog.....

Within the site config file (application_folder/config/config.php file), a base_url property is set. This is read by the base_url() method to generate server side redirections......

If you are creating a site which has more than domain name (ie. www.domain_one.com and www.domain_two.com), its probably a good idea to dynamically create this value in the config file. This way, the domain name is preserved when redirecting between pages.

//...config ...//
$config['base_url'] = 'http';
if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on") $config['base_url'] .= "s";

$config['base_url'] .= "://";

if ($_SERVER["SERVER_PORT"] != "80") $config['base_url'] .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"];
else $config['base_url'] .= $_SERVER["SERVER_NAME"];

$config["base_url"]."/";
//... config ...//