Sort associative array by attribute

sort.php

/*
        sortByAttribute($people, 'age'); //orders $people by age
        $people = [
            [
                'name' => 'Josep',
                'age'   => '22'
            ],
            [
                'name' => 'Laura',
                'age'   => '54'
            ],
        ]
    */
    public function sortByAttribute(&$arr, $attribute, $typeSort = SORT_DESC)
    {
        $num = []; //Array that is going to order the associative array $arr
        foreach($arr as $key => $row)
        {
            $num[$key] = $row[$attribute];
        }

        array_multisort($num, $typeSort, $arr);
        return $arr;
    }