phpstan level 1 errors reduction

homepage/participo/api/users.php

@@ -1,5 +1,8 @@
 <?php
+/** @var array $CONFIG basic configurations (defined via bootstraping) */
+/** @var array $SECRETS passwords and other stuff worth of protection (defined via bootstraping) */
 require_once "bootstrap.php";
+
 require_once "participoLib/participo.php";
 
 function init($config, $secrets)
@@ -18,6 +21,7 @@ function init($config, $secrets)
 
 function authorize()
 {
+    $allowKey = null;
     if (array_key_exists("HTTP_AUTHORIZATION", $_SERVER)) {
         if (!empty($_SERVER["HTTP_AUTHORIZATION"])) {
             $auth = explode(" ", $_SERVER["HTTP_AUTHORIZATION"]);