diff --git a/config/reverb.php b/config/reverb.php
index bd033ec..4771633 100644
--- a/config/reverb.php
+++ b/config/reverb.php
@@ -1,13 +1,6 @@
 <?php
 
-/**
- * 规范化 Reverb 允许的来源域名列表，兼容完整 URL、主机名和逗号分隔写法。
- *
- * @param  string|null  $rawOrigins  环境变量中声明的来源列表
- * @return array<int, string>
- */
-function chatroom_normalize_reverb_allowed_origins(?string $rawOrigins): array
-{
+$normalizeReverbAllowedOrigins = static function (?string $rawOrigins): array {
     if ($rawOrigins === null || trim($rawOrigins) === '') {
         return ['*'];
     }
@@ -35,7 +28,7 @@ function chatroom_normalize_reverb_allowed_origins(?string $rawOrigins): array
     }
 
     return array_values(array_unique($normalizedOrigins));
-}
+};
 
 return [
 
@@ -120,7 +113,7 @@ return [
                     'useTLS' => env('REVERB_SCHEME', 'https') === 'https',
                 ],
                 // Reverb 内部按 Origin 的主机名比对，这里统一转成 host，避免把完整 URL 写进 .env 后被误拒绝。
-                'allowed_origins' => chatroom_normalize_reverb_allowed_origins(env('REVERB_ALLOWED_ORIGIN')),
+                'allowed_origins' => $normalizeReverbAllowedOrigins(env('REVERB_ALLOWED_ORIGIN')),
                 'ping_interval' => env('REVERB_APP_PING_INTERVAL', 60),
                 'activity_timeout' => env('REVERB_APP_ACTIVITY_TIMEOUT', 30),
                 'max_connections' => env('REVERB_APP_MAX_CONNECTIONS'),