Online PHP editor | refs for 0Xa1a

<?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; }