What is the typical issue with displaying umlauts in PHP when reading *.rss files?

The typical issue with displaying umlauts in PHP when reading *.rss files is that the character encoding might not be properly set, leading to incorrect rendering of special characters like ü, ö, ä. To solve this issue, you can set the character encoding to UTF-8 using the header() function before reading the *.rss file.

header('Content-Type: text/html; charset=UTF-8');