Bootstrap/Load: Take the port number into consideration when determin…

…ing whether a subdomain installation of Multisite is allowed.

This results in the prevention of an installation running on a port on localhost (for example `localhost:8889`) being converted to a subdomain Multisite installation, whereas previously it was incorrectly allowed.

Props spacedmonkey 

See #21077


git-svn-id: https://develop.svn.wordpress.org/trunk@58125 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/network.php

@@ -33,8 +33,9 @@ function network_domain_check() {
  * @return bool Whether subdomain installation is allowed
  */
 function allow_subdomain_install() {
-	$domain = preg_replace( '|https?://([^/]+)|', '$1', get_option( 'home' ) );
-	if ( parse_url( get_option( 'home' ), PHP_URL_PATH ) || 'localhost' === $domain || preg_match( '|^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$|', $domain ) ) {
+	$home   = get_option( 'home' );
+	$domain = parse_url( $home, PHP_URL_HOST );
+	if ( parse_url( $home, PHP_URL_PATH ) || 'localhost' === $domain || preg_match( '|^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$|', $domain ) ) {
 		return false;
 	}