Create a PHP array of Country Codes and Names

countries_array.php

<?php
/**
 * Will write/overwrite an array to countries_en.php in the same directory.
 * $countries = [
 *     "AW" => "Aruba",
 *     "AF" => "Islamic Republic of Afghanistan",
 *     "AO" => "Republic of Angola",
 *     "AI" => "Anguilla",
 *     ...
 * @see https://restcountries.com for more information.
 */
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, 'https://restcountries.com/v3/all');
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
curl_close($curl);

$countries = json_decode($result);
$filename = 'countries_en.php';

file_put_contents($filename,
    "<?php\n\n\$countries = [\n");
foreach ($countries as $country) {
    $country_code = $country->cca2;
    $country_name = $country->name->official;
    file_put_contents($filename,
        "\t".'"'.$country_code.'" => "'.$country_name.'",'.PHP_EOL, FILE_APPEND);
}
file_put_contents($filename, "];", FILE_APPEND);