What are some best practices for sorting arrays with special characters like umlauts in PHP?

When sorting arrays with special characters like umlauts in PHP, it's important to use the `SORT_LOCALE_STRING` flag in the `sort()` function to ensure proper sorting based on the current locale settings. This flag tells PHP to use the current locale for string comparisons, which includes special characters like umlauts.

$fruits = ["äpfel", "banane", "birne", "aprikose"];
setlocale(LC_COLLATE, 'de_DE.UTF-8');
sort($fruits, SORT_LOCALE_STRING);
print_r($fruits);