Config

configs.php will be loaded if exists

configs-$ZF_ENV.php will be loaded if enviroment variable ZF_ENV is set

an array should be returned in config file

return [
    'key' => 'value';
];

retrieve

$app->get('key'); // if key is not set, `null` will be returned

$app->get('KEY'); // if the key starts with a upper case letter, $_SERVER['KEY'] will be returned

set

$app->set('key','value');

$app->set('pretty');    // equivelant to $app->set('pretty', true);
$app->set('nopretty');  // equivelant to $app->set('pretty', false);

$app->set(['pretty', 'mockup', 'key'=>'value']);