Circular (infinite) iterators in PHP. Because lol: https://github.com/alvaropinot/circular-iterator

circular-generator.php

<?php

function circularIterator(Iterator $t) {
    while (true) {
        yield $t->current();
        
        $t->next();
        
        if (!$t->valid()) {
            $t->rewind();
        }
    }
}

CircularIterator.php

<?php

class CircularIterator extends IteratorIterator {
    public function next()
    {
        parent::next();
        
        if (!$this->valid()) {
            $this->rewind();
        }
    }
}

usage.php

<?php

$something_iterable = SplFixedArray::fromArray([1, 2, 3]);

$iter = new CircularIterator($something_iterable);
// or `$iter = circularIterator($something_iterable);`

$iter->rewind();

var_dump($iter->current()); /* int(1) */ $iter->next();
var_dump($iter->current()); /* int(2) */ $iter->next();
var_dump($iter->current()); /* int(3) */ $iter->next();
var_dump($iter->current()); /* int(1) */ $iter->next();

• Using Iterator: https://3v4l.org/6qU4C
• Using Generator: https://3v4l.org/5cg8t

This is something that I wrote, https://gist.github.com/ppshobi/5d4da801fac3be866ea617a5d9637cca, In which you can go to the previous element as well