Phalcon configの環境切り分け方法

fastcgi_param で任意の変数（ここではAPP_ENV）を設定することで、php-fpmへ環境変数を渡せます

nginx.conf

location @app {
    fastcgi_pass  unix:/var/run/php-fpm/php-fpm.sock;

    fastcgi_split_path_info ^(.+\.php)(/.+)$;

    # Nginx側で環境設定を切り替え
    fastcgi_param APP_ENV   development;

    include fastcgi_params;
}

config.php

return new \Phalcon\Config([
    'production' => [
        'database' => [ 'host' => 'production.db' ]
    ],
    'staging' => [
        'database' => [ 'host' => 'staging.db' ]
    ],
    'development' => [
        'database' => [ 'host' => 'development.db' ]
    ],
]);

index.php

$di->setShared('config', function () {

   $config = include APP_PATH . "/config/config.php";

   return $config->get(getenv('APP_ENV'));

});