<?php

$a = [1 => 1, 2 => 2];
$b = [...$a, 3 => 3, 1 => 4];

dump($b);

array:3 [

  0 => 1

  1 => 4

  3 => 3

]

• Sort your data for each country individually
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PHP 7.4, Zend 3.0, Symfony 4.3, Laravel 5.8, PHPUnit 8.0, Doctrine 2.10