exchange strval with string cast

Signed-off-by: Simon L. <[email protected]>

Author: szaimen

php/src/Controller/DockerController.php

@@ -189,7 +189,7 @@ public function StartContainer(Request $request, Response $response, array $args
 
         $config = $this->configurationManager->GetConfig();
         // set AIO_URL
-        $config['AIO_URL'] = $host . ':' . strval($port) . $path;
+        $config['AIO_URL'] = $host . ':' . (string)$port . $path;
         // set wasStartButtonClicked
         $config['wasStartButtonClicked'] = 1;
         // set install_latest_major