Online PHP editor | output for 0Xa1a

@ 2020-03-02T20:50:35Z

<?php
class BeforeAfterIterator implements Iterator
{
    private $iterator;

        public function __construct(iterable $iterator, $before, $after)
        {
            if (!$iterator instanceof Iterator) {
                $iterator = (function ($iterable) {
                    yield from $iterable;
                })($iterator);
            }
            
            if ($iterator->valid()) {
                $this->iterator = new AppendIterator();
                $this->iterator->append(new ArrayIterator([$before]));
                $this->iterator->append($iterator);
                $this->iterator->append(new ArrayIterator([$after]));
            } else {
                $this->iterator = new ArrayIterator([]);
            }
        }

    public function current()
    {
        return $this->iterator->current();
    }

    public function next()
    {
        $this->iterator->next();
    }

    public function key()
    {
        return $this->iterator->key();
    }

    public function valid()
    {
        return $this->iterator->valid();
    }

    public function rewind()
    {
        $this->iterator->rewind();
    }
}

$begin = new DateTime('2020-02-01');
$end = new DateTime('2020-02-29');

$interval = new DateInterval('P1D');
$daterange = new DatePeriod($begin, $interval ,$end);

foreach (new BeforeAfterIterator($daterange, new \DateTime('2020-01-31'), new \DateTime('2020-03-01')) as $value) {
    echo $value->format('Y-m-d'), PHP_EOL;
}

foreach (new BeforeAfterIterator(range(1, 10), 'Before', 'After') as $value) {
    echo $value, PHP_EOL;
}

function generator() {
    yield from [1, 2, 3, 4, 5];
}

foreach (new BeforeAfterIterator(generator(), 'Before', 'After') as $value) {
    echo $value, PHP_EOL;
}

Output for 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2: Deprecated: Return type of BeforeAfterIterator::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/0Xa1a on line 24 Deprecated: Return type of BeforeAfterIterator::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/0Xa1a on line 29 Deprecated: Return type of BeforeAfterIterator::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/0Xa1a on line 34 Deprecated: Return type of BeforeAfterIterator::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/0Xa1a on line 39 Deprecated: Return type of BeforeAfterIterator::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/0Xa1a on line 44 2020-01-31 2020-02-01 2020-02-02 2020-02-03 2020-02-04 2020-02-05 2020-02-06 2020-02-07 2020-02-08 2020-02-09 2020-02-10 2020-02-11 2020-02-12 2020-02-13 2020-02-14 2020-02-15 2020-02-16 2020-02-17 2020-02-18 2020-02-19 2020-02-20 2020-02-21 2020-02-22 2020-02-23 2020-02-24 2020-02-25 2020-02-26 2020-02-27 2020-02-28 2020-03-01 Before 1 2 3 4 5 6 7 8 9 10 After Before 1 2 3 4 5 After
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: 2020-01-31 2020-02-01 2020-02-02 2020-02-03 2020-02-04 2020-02-05 2020-02-06 2020-02-07 2020-02-08 2020-02-09 2020-02-10 2020-02-11 2020-02-12 2020-02-13 2020-02-14 2020-02-15 2020-02-16 2020-02-17 2020-02-18 2020-02-19 2020-02-20 2020-02-21 2020-02-22 2020-02-23 2020-02-24 2020-02-25 2020-02-26 2020-02-27 2020-02-28 2020-03-01 Before 1 2 3 4 5 6 7 8 9 10 After Before 1 2 3 4 5 After

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