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@ 2015-10-13T22:53:50Z

<?php

function yieldFrom($iter) {
    $isSubgenerator = $iter instanceof Generator;
    $received = null;
    $send = true;
 
    while ($iter->valid()) {
        if ($isSubgenerator) {
            $next = $send ? $iter->send($received) : $iter->throw($received);
        } else {
            $next = $iter->current();
            $iter->next();
        }
        try {
            $received = yield $next;
            $send = true;
        } catch (Exception $e) {
            if ($isSubgenerator) {
                $received = $e;
                $send = false;
            } else {
                throw $e;
            }
        }
    }
 
    return $isSubgenerator ? $iter->getReturn() : null;
};

function gen1() {
    yield 1;
    yield 2;
    yield 3;
}

function gen2() {
    yield from gen1();
}

$x = yieldFrom(gen1());

foreach($x as $val) { var_dump($val); }

Output for git.master, git.master_jit, rfc.property-hooks: int(2) int(3) NULL

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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