Поправил namespace

src/Url.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace ctiso;
+
+class Url {
+    function __construct($parts = []) {
+        $this->parts = $parts;
+    }
+
+    function toString() {
+        return '?' . http_build_query($this->parts);
+    }    
+}