Online PHP editor | refs for 4dZbp

<?php namespace GeneratorExample; function pipe() { $generators = func_get_args(); return function() use ($generators) { $inputs = func_get_args(); foreach ($generators as $g) { $generator = call_user_func_array($g, $inputs); $inputs = [$generator]; } return $generator; }; } $uppercase = function(\Traversable $in) { foreach ($in as $word) { yield strtoupper($word); } }; $reverse = function(\Traversable $in) { foreach ($in as $word) { yield strrev($word); } }; $println = function(\Traversable $in) { foreach ($in as $line) { echo "$line\n"; } }; $words = new \ArrayIterator(["foo", "bar", "baz"]); $p = pipe($uppercase, $reverse, $println); $p($words);