Is there a way to get the list of available locales in PHP?

Question

In Java, you can call Locale.getAvailableLocales() to get the list of available locales.

I was expecting an equivalent from the PHP Locale class, but co

Answer 1

This might be a slight deviation from OP, but I feel it is a common enough use-case to be mentioned here. What if you want a list of language code, as defined by ICU, instead of a list of locales ?

List of all languages

The solution based on ResourceBundle::getLocales(''); will get you locales. You then need to map them to language codes. But even after that the list of language is not complete.

Here is a comparison with how to do it properly:

 $languageName) {
        $languages[] = $languageCode;
    }

    return $languages;
}

function languageForEndUser($language): string
{
    return Locale::getDisplayLanguage($language, $language) . ' (' . Locale::getDisplayLanguage($language) . ')';
}

$list1 = getListFromLocales();
$list2 = getListFromLanguages();

echo 'languages in list1: ' . count($list1) . PHP_EOL;
echo 'languages in list2: ' . count($list2) . PHP_EOL;
echo 'languages that exists in list1, but not in list2: ' . count(array_diff($list1, $list2)) . PHP_EOL;
echo 'languages that exists in list2, but not in list1: ' . count(array_diff($list2, $list1)) . PHP_EOL;

Locale::setDefault('fr'); // Assume end-user speaks french

echo 'examples of language for end-user: ' . PHP_EOL;
echo '    - ' . languageForEndUser('en') . PHP_EOL;
echo '    - ' . languageForEndUser('fr') . PHP_EOL;
echo '    - ' . languageForEndUser('ko') . PHP_EOL;

This will output something similar to:

languages in list1: 204
languages in list2: 620
languages that exists in list1, but not in list2: 0
languages that exists in list2, but not in list1: 416
examples of language for end-user: 
    - English (anglais)
    - français (français)
    - 한국어 (coréen)

where we can see that the proper way yields ~400 (!) more languages.

You can see the code in action on https://3v4l.org/TS292