In PHP, why is it important to specify the character set in functions like htmlentities to avoid default settings that may change in future versions?

It is important to specify the character set in functions like htmlentities in PHP to avoid relying on default settings that may change in future versions. By explicitly setting the character set, you ensure consistent behavior across different PHP versions and prevent unexpected changes in encoding that could lead to security vulnerabilities or display issues.

// Specify the character set in htmlentities function
$encoded_string = htmlentities($input_string, ENT_QUOTES, 'UTF-8');