Fix PHP unit test isolation

services/nginx/app/classes/customer_name_cache_payload_builder.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace classes;
+
+class customer_name_cache_payload_builder
+{
+    /**
+     * @return array{name:string}|null
+     */
+    public static function build(mixed $cached_name, ?string $fallback_name): ?array
+    {
+        if (
+            is_object($cached_name)
+            && isset($cached_name->name)
+            && is_string($cached_name->name)
+            && trim($cached_name->name) !== ''
+        ) {
+            return ['name' => $cached_name->name];
+        }
+
+        if ($fallback_name !== null && trim($fallback_name) !== '') {
+            return ['name' => $fallback_name];
+        }
+
+        return null;
+    }
+}