What is the impact of server configuration on the output of PHP code containing special characters?

The impact of server configuration on the output of PHP code containing special characters can lead to encoding issues, resulting in incorrect display or rendering of special characters. To solve this issue, it is important to ensure that the server configuration is set to the correct character encoding, such as UTF-8, to properly handle special characters in PHP code.

// Set the character encoding to UTF-8 in PHP
header('Content-Type: text/html; charset=UTF-8');