How to replace array keys with predefined values

Question

Assuming that I have following situation:

I have an array like this:

$array = array(1 => "text1",2 => "text2", 3 => "Text3" , 4 => "Text4");

After some functions I receive a string which contains these values:

$string = "2,1,4,3"; // this values are dynamic 

What I want to achieve is to sort that array ( $array ) in the string's order; so the result should be:

<--- some function --- > 
$result = array(2 => "text2",1=> "text1",4=>"Text4",3=>"Text3"));

Answer 1

PHP's array_multisort() function - http://php.net/manual/en/function.array-multisort.php

Untested, but probably something like:

array_multisort(explode(",", $string), $array);

Keys may get lost though.

Answer 2

$keyArr = explode(',', $string);
$sortedArr = array();

foreach ($keyArr as $key)
{
    $sortedArr[$key] = $array[$key];
}

Answer 3

1. Break up the string into indexes with explode
2. Make an empty array $result
3. Iterate over the exploded array of keys, doing $result[$key] = $input[$key]

See it in action .