Sort PHP array through another array which specifies the sort order by value (values are not keys in first array)

I have two PHP-arrays and i want to sort the first by using the second. for example my first array could be:

[
"Hello" => "Hallo", 
"World" => "Welt", 
"PHP" => "PHP", 
"Symfony" => "Symfony"
]

If my second array now is this:

[
    "0" => "2", 
    "1" => "1", 
    "2" => "3", 
    "3" => "0"
]

This second array always has values from 0 to n and no duplicates. I want to sort the first array by the numbers in the second so it should look like that:

[
    "Symfony" => "Symfony", 
    "World" => "Welt", 
    "Hello" => "Hallo", 
    "PHP" => "PHP"
]

How can i sort my array like that?

I asked this question before and i got referred to this question, but i can’t make out the solution for my case as i don’t know the keys and values in the first array. It should work for every key, so please don’t just refer me to this question again because i don’t get how this helps me.. Thanks

Answer

<?php

$a1 = [
    "Hello" => "Hallo", 
    "World" => "Welt", 
    "PHP" => "PHP", 
    "Symfony" => "Symfony",
];

$a2 = [
    "0" => "2", 
    "1" => "1", 
    "2" => "3", 
    "3" => "0",
];

//it will rearrange all arrays based on the first array order
array_multisort($a2, SORT_ASC, $a1);
print_r($a1);

Output:

Array
(
    [Symfony] => Symfony
    [World] => Welt
    [Hello] => Hallo
    [PHP] => PHP
)