Rust-like iterator written in PHP

This is raw version of iterator for PHP version 8.0

In speed, of course, it is inferior to ordinary loop, but with enabled JIT, it is fast enough

Some example:

$punctuations = array(',', '.', '!', '?');
$iterators = [
    Iterator::range(0, 20)->rev(),
    [2, 4, 1, 23, 15, -1, 12],
    Iterator::chars('some, interesting string!')->filter(function($c) use (&$punctuations) {
        return !in_array($c, $punctuations);
    }),
    Iterator::repeat('!')->take(8),
    Iterator::repeat_with(fn() => mt_rand(0, 100))->take(4)
];

echo 'Result: ' . Iterator::from($iterators)->flatten()->join(', ') . PHP_EOL;