What are some potential reasons for encountering strange characters in an RSS feed despite using <meta charset="utf-8"> in PHP?

When encountering strange characters in an RSS feed despite using <meta charset="utf-8"> in PHP, it could be due to the encoding of the content being different from utf-8. To solve this issue, you can try explicitly setting the encoding of the content to utf-8 using PHP's header() function.

header('Content-Type: text/xml; charset=utf-8');