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<?php
namespace Bdf\Form\Choice;
/**
* Proxy choice using a callback for generate the choices array
*
* @template T
* @implements ChoiceInterface<T>
* @final
*/
/*final*/ class LazyChoice implements ChoiceInterface
{
* The lazy callback with returns choices
* @var callable():(T[]|ChoiceInterface<T>)
private $resolver;
* The choice object
* @var ChoiceInterface<T>|null
private $choices;
* LazyChoice constructor.
* @param callable():(T[]|ChoiceInterface<T>) $resolver
public function __construct(callable $resolver)
$this->resolver = $resolver;
}
* {@inheritdoc}
public function values(): array
return $this->build()->values();
public function view(?callable $configuration = null): array
return $this->build()->view($configuration);
* Resolve the lazy choice list
private function build(): ChoiceInterface
if ($this->choices !== null) {
return $this->choices;
$choices = ($this->resolver)();
if (!$choices instanceof ChoiceInterface) {
$choices = new ArrayChoice((array) $choices);
return $this->choices = $choices;
b2pweb /
bdf-form
