Online PHP editor | refs for 5EcYk

<?php function debugPrintFilter() { return function(\Traversable $input) { foreach ($input as $in) { var_dump($in); yield $in; } }; } class FilterPipeline implements \IteratorAggregate { protected $filters = []; protected $src; function __construct() { } function src(\Traversable $it) { $this->src = $it; return $this; } function pipe(callable $filter) { array_push($this->filters, $filter); return $this; } function getIterator() { $it = $this->src; foreach ($this->filters as $filter) { $it = $filter($it); } return $it; } } $p = (new FilterPipeline) ->src(new \ArrayIterator(["foo", "bar", "baz"])) ->pipe(debugPrintFilter()); foreach ($p as $val) {}