What are the differences between UTF-8 and ISO-8859-1 encoding in PHP and how do they impact special character display?

UTF-8 and ISO-8859-1 are two different character encodings in PHP. UTF-8 supports a wider range of characters including special characters from various languages, while ISO-8859-1 only supports a limited set of characters. When displaying special characters, using UTF-8 encoding ensures that all characters are properly displayed.

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