iterator_map function using Generators

iterator_map.php

<?php

function iterator_map(callable $callback)
{
    $iterators = array_slice(func_get_args(), 1);

    $multi = new MultipleIterator;
    foreach ($iterators as $it) {
        $multi->attachIterator($it);
    }

    foreach ($multi as $current) {
        yield call_user_func_array($callback, $current);
    }
}

$it = new ArrayIterator([0, 1, 2, 3]);
$it2 = new ArrayIterator(['zero', 'one', 'two', 'three']);

$map = iterator_map(
    function($number, $word) {
        return [$number, $word];
    },
    $it, $it2
);

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

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