Online PHP editor | output for S8I7Z

@ 2018-09-24T12:40:36Z

<?php
class MyCollection extends ArrayObject
{
    public function updateIndexes() {
        $this->exchangeArray(array_values($this->getArrayCopy()));
    }
}

$collection = new MyCollection([
    'first',
    'second',
    'third',
]);

var_dump($collection);

$collection->offsetUnset(1);

var_dump($collection);

$collection->updateIndexes();

var_dump($collection);

Output for 5.6.38, 7.1.0 - 7.1.22, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: object(MyCollection)#1 (1) { ["storage":"ArrayObject":private]=> array(3) { [0]=> string(5) "first" [1]=> string(6) "second" [2]=> string(5) "third" } } object(MyCollection)#1 (1) { ["storage":"ArrayObject":private]=> array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } } object(MyCollection)#1 (1) { ["storage":"ArrayObject":private]=> array(2) { [0]=> string(5) "first" [1]=> string(5) "third" } }

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