What are the implications of using iso-8859-15 encoding for special characters like the Euro symbol in PHP?

When using iso-8859-15 encoding in PHP, special characters like the Euro symbol may not display correctly. To ensure proper display of special characters, you can use UTF-8 encoding instead, which supports a wider range of characters including the Euro symbol.

// Set the encoding to UTF-8 to properly display special characters
header('Content-Type: text/html; charset=utf-8');