fix: only variables should be passed by reference

src/Utils/Logger/Logger.php

@@ -25,9 +25,11 @@ class Logger {
         $ip = '(n-a)';
 
         if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
-            $ip = array_shift(
+            $arr = array_map(
-                array_map('trim', explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']))
+                'trim',
+                explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'])
             );
+            $ip = array_shift($arr);
         } else if (isset($_SERVER['REMOTE_ADDR'])) {
             $ip = $_SERVER['REMOTE_ADDR'];
         }