A fix for running a wordpress with a new url, setting WP_HOME and WP_SITEURL to whatever is in $_SERVER['HTTP_HOST']

gistfile1.php

/** Automaticly set the correct WP_HOME and WP_SITEURL based on HTTP_HOST */
$absolute_url = "http" . ($_SERVER['HTTPS'] ? 's' : '') . "://{$_SERVER['HTTP_HOST']}";
if ($_SERVER['HTTP_PORT'] != 80 || $_SERVER['HTTP_PORT'] != 443) {
	$absolute_url .= "{$_SERVER['HTTP_PORT']}";
}

define('WP_HOME', $absolute_url);
define('WP_SITEURL', $absolute_url);