[Web] Fix broken autoconfig ports, fixes #4221 (#4223)

Refactored to use function, moved another function

Signed-off-by: Kristian Feldsam <feldsam@gmail.com>

data/web/inc/functions.inc.php

@@ -2219,4 +2219,14 @@ function cleanupCSS($ignore = '', $folder = '/tmp/*.css') {
   }
 }
 
-?>
+function get_remote_ip() {
+  $remote = $_SERVER['REMOTE_ADDR'];
+  if (filter_var($remote, FILTER_VALIDATE_IP) === false) {
+    return '0.0.0.0';
+  }
+  return $remote;
+}
+
+function getEnvPort(string $name): int {
+	return (int)filter_var(substr(getenv($name), strrpos(getenv($name), ':')), FILTER_SANITIZE_NUMBER_INT);
+}