What are the potential pitfalls of using Umlauts in URLs in PHP?

Using Umlauts in URLs in PHP can lead to encoding issues and potential errors when processing the URL. To avoid this, it is recommended to encode the Umlauts using PHP's urlencode() function before using them in URLs. This will ensure that the Umlauts are properly encoded and will be interpreted correctly by the server.

$url = "https://example.com/?query=" . urlencode("Möglichkeiten");
echo $url;