What are some common pitfalls when using array_multisort with German umlauts in PHP?

When using array_multisort with German umlauts in PHP, a common pitfall is that the sorting may not work as expected due to the special characters. To solve this issue, you can use the SORT_LOCALE_STRING flag in array_multisort to perform a locale based sorting that takes into account the umlauts.

// Sample array with German umlauts
$array = array("ä", "ö", "ü", "ß");

// Sort the array using array_multisort with SORT_LOCALE_STRING flag
array_multisort($array, SORT_LOCALE_STRING);

// Output the sorted array
print_r($array);