Online PHP editor | output for b4AWq

<?php class Foo { private $bar = []; public function fill($limit = 100) { for ($i = 0; $i < $limit; $i++) { $this->bar[] = mt_rand($i, $limit); } } public function getEvenCounter() : Countable { return function () implements Countable { $counter = 0; foreach ($this->bar as $value) { if ($value % 2 === 0) $counter++; } return $counter; }; } public function getOddCounter() : Countable { return function () implements Countable { $counter = 0; foreach ($this->bar as $value) { if ($value % 2 !== 0) { $counter++; } } return $counter; }; } } $foo = new Foo(); $even = $foo->getEvenCounter(); $odd = $foo->getOddCounter(); $it = 0; while (++$it<10) { $foo->fill(50); var_dump( count($even), count($odd)); } ?>