Sort an array keeping the indexes and their values through an anonymous function.

Question

What does this snippet do?
```php
<?php
uasort($array, static function($a, $b){
        return $a <=> $b;
});
```

Accepted Answer

it sorts the array keeping the indexes and their values through an anonymous function.

Answer

it returns an error, the"static"keyword can only be used in a class.

Answer

it sorts the array by keeping the indexes and their values, the"static"keyword allowing the result to be stored in memory for a next call.

Answer

it sorts the array keeping the indexes and their values through a private function.

Question from the PHP7 test