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@ 2013-07-29T12:07:40Z

<?php
// Everything you enter here will be executed by our servers. Try it!

function iterator_compose()
{
    foreach (array_reverse(func_get_args()) as $it) {
        if (is_callable($it)) {
            $prev = $it;
        }
    }
}

function iterator_chunk(\Traversable $it, $chunkSize)
{
    $it = $it->rewind();
	$chunk = [];
    $steps = range(0, $chunkSize);

    while (true) {
        foreach ($steps as $_) {
			if (!$it->valid()) {
                break 2;
            }

			$chunk[] = $it->current();
			$it->next();
        }

        yield $chunk;
        $chunk = [];
    }

    if ($chunk) {
        yield $chunk;
    }
}

$it = new ArrayIterator(range(0, 125));

foreach (iterator_chunk($it, 32) as $i => $c) {
	echo "====== Chunk $i ======\n";
    var_export($c);
    echo "\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Call to a member function valid() on null in /in/KdI1n:21 Stack trace: #0 /in/KdI1n(40): iterator_chunk(NULL, 32) #1 {main} thrown in /in/KdI1n on line 21
Process exited with code 255.

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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