zanysoft / laravel-serpapi

src/config/config.php

<?php

return [
    /*
    |----------------------------------------------------------------------------
    | SerpApi Key
    |----------------------------------------------------------------------------
    */
    'api_key' => env('SERPAPI_API_KEY', ''),

The function env was not found. Maybe you did not declare it correctly or list all dependencies?

    /*
    |----------------------------------------------------------------------------
    | SerpApi Key
    |----------------------------------------------------------------------------
    */
    'search_engine' => env('SERPAPI_ENGINE', 'google'),
];