(legacy) alias url issue, https://github.com/opnsense/core/issues/457

src/etc/inc/util.inc

@@ -998,12 +998,13 @@ function alias_get_type($name) {
 function alias_expand($name) {
 	global $aliastable;
 
-	if (isset($aliastable[$name]))
+	if (array_key_exists($name, $aliastable)) {
 		return "\${$name}";
-	else if (is_ipaddr($name) || is_subnet($name) || is_port($name) || is_portrange($name))
+	} elseif (is_ipaddr($name) || is_subnet($name) || is_port($name) || is_portrange($name)) {
 		return "{$name}";
-	else
+	} else {
 		return null;
+	}
 }
 
 function subnet_size($subnet) {