Online PHP editor | output for N9k7P

<?php class Collection { public $fixedArray; public function __construct(SplFixedArray $splFixedArray) { $this->fixedArray = $splFixedArray; } public function getSum() { $sum = 0; $arr = $this->fixedArray; foreach ($arr as $item) { $sum += $item; } return $sum; } } $spl = SplFixedArray::fromArray([0, 1, 2]); $collection = new Collection($spl); $collArr = $collection->fixedArray; echo 'Test #1'.PHP_EOL; $i = 0; foreach ($collArr as $item) { echo '-- iteration: ' . $i . ', item: ' . $item .', sum: ' . $collection->getSum() . PHP_EOL; $i++; } echo 'Expected 3 iterations, executed ' . $i . PHP_EOL; echo PHP_EOL; echo 'Test #2'.PHP_EOL; $i = 0; // Note, unless we use $collection->getSum() inside the loop - it works as expected! foreach ($collArr as $item) { echo '-- iteration: ' . $i . ', item: ' . $item . PHP_EOL; $i++; } echo 'Expected 3 iterations, executed ' . $i . PHP_EOL;