How can encoding issues, such as with "€", impact the functionality of a PHP script?

Encoding issues, such as using special characters like "€", can impact the functionality of a PHP script by causing errors or unexpected behavior when trying to display or process the content. To solve this issue, you can use the PHP function htmlspecialchars() to encode special characters, ensuring they are displayed correctly in the output.

$text = "Price: €10";
echo htmlspecialchars($text, ENT_QUOTES);