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Bugs & Features
<?php namespace GeneratorExample; class Pipeline { protected $generators = []; function __construct() { } function add(callable $generator) { $this->generators[] = $generator; return $this; } function resolve() { $inputs = func_get_args(); foreach (array_reverse($this->generators) as $g) { $generator = call_user_func_array($g, $inputs); $inputs = [$generator]; } return $generator; } } function uppercase(\Traversable $in) { foreach ($in as $word) { yield strtoupper($word); } } function reverse(\Traversable $in) { foreach ($in as $word) { yield strrev($word); } } function each_println(\Traversable $in) { foreach ($in as $line) { echo "$line\n"; } } $words = new \ArrayIterator(["foo", "bar", "baz"]); $p = new Pipeline; $p->add("GeneratorExample\\uppercase")->add("GeneratorExample\\reverse")->add("GeneratorExample\\each_println"); $p->resolve($words);

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for Typed properties v2
foo bar baz Fatal error: Uncaught TypeError: Argument 1 passed to GeneratorExample\reverse() must implement interface Traversable, null given in /in/SmH2d:39 Stack trace: #0 [internal function]: GeneratorExample\reverse(NULL) #1 /in/SmH2d(24): call_user_func_array('GeneratorExampl...', Array) #2 /in/SmH2d(57): GeneratorExample\Pipeline->resolve(Object(ArrayIterator)) #3 {main} thrown in /in/SmH2d on line 39
Output for Array change keys
foo bar baz Fatal error: Uncaught TypeError: Argument 1 passed to GeneratorExample\reverse() must implement interface Traversable, null given in /in/SmH2d:39 Stack trace: #0 [internal function]: GeneratorExample\reverse(NULL) #1 /in/SmH2d(24): call_user_func_array('GeneratorExampl...', Array) #2 /in/SmH2d(57): GeneratorExample\Pipeline->resolve(Object(ArrayIterator)) #3 {main} thrown in /in/SmH2d on line 39
Output for Lexical anon
foo bar baz

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page