Route Generator

Pagerfanta uses a route generator as a mechanism for building URLs to different pages in a paginated list.

A route generator is any callable which accepts a single $page parameter (the page to build the URL for) and returns the URL for the page being requested.

$routeGenerator = function (int $page): string {
    return 'http://localhost/blog?page=' . $page;

Generator Interface

It is recommended that route generators are classes which implement Pagerfanta\RouteGenerator\RouteGeneratorInterface.

Generator Factory

Often, it is necessary to configure a route generator based on runtime information (such as data from the current request). The Pagerfanta\RouteGenerator\RouteGeneratorFactoryInterface defines a class which can assist in building your route generators.

A basic example of how these factories can be used is with a Twig extension when rendering your pagination list.


namespace App\Twig;

use Pagerfanta\Pagerfanta;
use Pagerfanta\RouteGenerator\RouteGeneratorFactoryInterface;
use Pagerfanta\RouteGenerator\RouteGeneratorInterface;
use Pagerfanta\View\ViewFactoryInterface;
use Twig\Extension\AbstractExtension;
use Twig\TwigFunction;

final class PagerfantaExtension extends AbstractExtension
    private RouteGeneratorFactoryInterface $routeGeneratorFactory;
    private ViewFactoryInterface $viewFactory;

    public function __construct(RouteGeneratorFactoryInterface $routeGeneratorFactory, ViewFactoryInterface $viewFactory)
        $this->routeGeneratorFactory = $routeGeneratorFactory;
        $this->viewFactory = $viewFactory;

    public function getFunctions(): array
        return [
            new TwigFunction('pagerfanta', [$this, 'renderPagerfanta'], ['is_safe' => ['html']]),

    public function renderPagerfanta(Pagerfanta $pagerfanta, string $view, array $options = []): string
        return $this->viewFactory->get($view)
            ->render($pagerfanta, $this->createRouteGenerator($options), $options);

    private function createRouteGenerator(array $options = []): RouteGeneratorInterface
        return $this->routeGeneratorFactory->create($options);

Generator Decorator

Included in the core API is the Pagerfanta\RouteGenerator\RouteGeneratorDecorator class which can be used to decorate any route generator, whether the generator implements the interface or any callable.

The primary reason this class was created is to allow any generator to be used within Twig, but the decorator can also be used to enforce strict typehinting for generators.

When using the Twig view, it will automatically decorate any route generator so you will not need to do this on your own.