How can using UTF-8 encoding help resolve umlaut transfer issues in PHP?

When transferring data containing umlaut characters in PHP, issues may arise due to encoding differences between systems. Using UTF-8 encoding can help resolve these issues by ensuring that the umlaut characters are properly encoded and decoded across different platforms. To implement UTF-8 encoding in PHP, you can set the default charset to UTF-8 using the header() function.

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