UTF-8

Remarks

• You need to make sure that every time you process a UTF-8 string, you do so safely. This is, unfortunately, the hard part. You’ll probably want to make extensive use of PHP’s mbstring extension.
• PHP’s built-in string operations are not by default UTF-8 safe. There are some things you can safely do with normal PHP string operations (like concatenation), but for most things you should use the equivalent mbstring function.