PHP: Set index array based on other array

Question

I have the following two hypothetical arrays:

$values = array("fourth", "first", "second", "third");
$indices = array(3, 0, 1, 2);

What is the fastest way to rearrange $values based on $indices?

Is there perhaps some way to do $values->index_array = $indices?

Answer 1

I'd do:

<?php
$newarray = array_fill_keys($indices, $values);
?>

This assumes your indices are always unique of course.

Answer 2

It's just a guess based on a phrase from the question:

way to rearrange $values based on $indices

$values = array("fourth", "first", "second", "third"); $indices = array(3, 0, 1, 2);

array_multisort($indices, $values);

var_dump($values);

Online demo: http://ideone.com/UKfNiq

Output is:

array(4) {
  [0]=>
  string(5) "first"
  [1]=>
  string(6) "second"
  [2]=>
  string(5) "third"
  [3]=>
  string(6) "fourth"
}

Answer 3

ZerkMS's answer is correct as defined by the question but you may be better off taking another approach to generating the results.

If you can, rather than generating two arrays of:

$values = array("fourth", "first", "second", "third"); 
$indices = array(3, 0, 1, 2);

instead just generate one array and call ksort on it:

$valuesToSort = array();
$valuesToSort[3] = 'fourth';
$valuesToSort[0] = 'first';
$valuesToSort[1] = 'second';
$valuesToSort[2] = 'third';

ksort($valuesToSort);