Fatal error: Uncaught Error: Call to undefined function think\getenv() in /www/wwwroot/V6/niucloud/vendor/topthink/framework/src/think/Env.php:86 Stack trace: #0 /www/wwwroot/V6/niucloud/vendor/topthink/framework/src/think/Env.php(81): think\Env->getEnv() #1 /www/wwwroot/V6/niucloud/vendor/topthink/framework/src/think/App.php(445): think\Env->get() #2 /www/wwwroot/V6/niucloud/vendor/topthink/framework/src/think/Http.php(178): think\App->initialize() #3 /www/wwwroot/V6/niucloud/vendor/topthink/framework/src/think/Http.php(155): think\Http->initialize() #4 /www/wwwroot/V6/niucloud/public/index.php(24): think\Http->run() #5 {main} thrown in /www/wwwroot/V6/niucloud/vendor/topthink/framework/src/think/Env.php on line 86