php - Sort Array and Store Indexes in a seperate array -

i'd sort array , store indexes array while keeping original 1 in order now.

array ( [0] => 2000          [1] => 2015          [2] => 2004          [3] => 1990          [4] => 1995          [5] => 1965          [6] => 1990 )  

so new 1 should this:

array ( [0] => 5          [1] => 3          [2] => 6          [3] => 4          [4] => 0          [5] => 2          [6] => 1 )  

create copy of array; use asort preserve indexes; use array_keys array containing indexes:

$arr = array(2000,2015,2004,1990,1995,1965,1990); $arr2 = $arr; asort($arr2); $indexes = array_keys($arr2);