Online PHP editor | rfc for RFUDY

@ 2013-04-18T10:12:33Z

<?php

namespace GeneratorExample;

class Pipeline
{
    protected $generators = [];

    function __construct()
	{
    }

    function add(callable $generator)
    {
        $this->generators[] = $generator;
        return $this;
    }

    function __invoke()
    {
		$inputs = func_get_args();

        foreach ($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");
$p($words);

Output for git.master, git.master_jit, rfc.property-hooks: OOF RAB ZAB

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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