How to change orders of array?

Question

$a = array(0=>\'a\',1=>\'b\',2=>\'c\', 3=>\'d\');

I want to change the order to be 3,2,0,1：

$a = array(3=>\         


        

Answer 1

The easiest way to do it with uksort(), more functional way:

$a = ['a','b','c','d'];
$order = [3, 2, 0, 1];

uksort($a, function($x, $y) use ($order) {
    return array_search($x, $order) > array_search($y, $order);
});

print_r($a); // [3 → d, 2 → c, 0 → a, 1 → b]