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<?php class test { private $whatever = false; public function __construct() { $a = iterator_to_array($this->firstIterator()); $b = iterator_to_array($this->secondIterator($this->firstIterator())); $c = iterator_to_array($this->thirdIterator($this->firstIterator())); $this->whatever = true; $d = iterator_to_array($this->firstIterator()); $e = iterator_to_array($this->secondIterator($this->firstIterator())); $f = iterator_to_array($this->thirdIterator($this->firstIterator())); var_dump([$a, $b, $c, $d, $e, $f]); } public function firstIterator(): \Iterator { yield 'a'=> 1; yield 'b'=> 2; yield 'c'=> 3; } public function secondIterator(\Iterator $first): \Iterator { if ($this->whatever === true) { return $first; } foreach($first as $key=>$value) { yield $key => $value * $value; } } public function thirdIterator(\Iterator $first): \Iterator { if ($this->whatever === true) { return $first; } return $this->thirdSubIterator($first); } public function thirdSubIterator(\Iterator $first): \Iterator { foreach($first as $key=>$value) { yield $key => $value * $value; } } } new test();
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.27, 8.0.0 - 8.0.15, 8.1.0 - 8.1.2
array(6) { [0]=> array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } [1]=> array(3) { ["a"]=> int(1) ["b"]=> int(4) ["c"]=> int(9) } [2]=> array(3) { ["a"]=> int(1) ["b"]=> int(4) ["c"]=> int(9) } [3]=> array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } [4]=> array(0) { } [5]=> array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } }

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