public static function is($feature) {
        return function ($features) use ($feature) {
            return fphp\Model\Feature::has($features, $feature);
        };
    }
public static function is($feature) {
        return function ($features) use ($feature) {
            return fphp\Model\Feature::has($features, $feature);
        };
    }
public static function is ( $ feature ) { return function ( $ features ) use ( $ feature ) { return fphp \ Model \ Feature :: has ( $ features , $ feature ) ; } ; }
Returns a formula that tests for the presence of a feature.
@param Feature $feature
@return callable
Returns a formula that tests for the presence of a feature .