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<?php
declare(strict_types=1);
namespace DanBettles\Gestalt;
use const false;
use const null;
/**
* A simple unidirectional filter chain.
*/
class SimpleFilterChain
{
private $filters;
public function __construct(array $filters = [])
$this->setFilters($filters);
}
public function appendFilter(callable $filter): self
$this->filters[] = $filter;
return $this;
private function setFilters(array $filters): self
$this->filters = [];
foreach ($filters as $filter) {
$this->appendFilter($filter);
public function getFilters(): array
return $this->filters;
* Invokes each filter in turn; the specified 'request' will be passed to each filter.
*
* Iteration will stop if a filter returns the value of `$valueToBreak`. If iteration is forcibly stopped then the
* method will return the value of `$valueToBreak`. If, however, iteration is allowed to continue until completion
* then the method will return `null`.
* @param mixed $request
* @param mixed $valueToBreak
* @return mixed
public function execute(&$request, $valueToBreak = false)
foreach ($this->getFilters() as $filter) {
$returnValue = $filter($request);
if ($valueToBreak === $returnValue) {
return $returnValue;
return null;
danbettles /
gestalt
