What are common issues with Umlaut characters in PHP applications?

Common issues with Umlaut characters in PHP applications include encoding problems when displaying or processing these characters. To solve this, you can use the `utf8_encode()` function to convert the string to UTF-8 encoding before working with it in your PHP application.

$umlautString = "Möglichkeiten";
$utf8String = utf8_encode($umlautString);
echo $utf8String;