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

A more general aproach:

$ex_count = count($ex_names_rev_order);
$j = 0;
$ex_good_order = array();
for ($i=($ex_count - 1); $i >= 0 ; $i--) { 

    $ex_good_order[$j] = $ex_names_rev_order[$i];
    $j++;
}