• new feature
• BC break? no
• doc PR: will

Proposed Arrays::updateDiff() compares two associative arrays and returns such items from later one, which does not exist or differs from first one. By other words - which items have to be updated in first array, to be the same as second array.

As far as I know, there is no PHP function for that (playground). For examle:

$from = ['a' => null];
$to = ['a' => false];
# I didn't find a PHP function which returns
$diff = ['a' => false];

There are posible things to debate:

• function name
• arguments order
• recursive version
• objects comparing
• 3rd argument callable $comparator = null