Multibyte trim in PHP?

Question

Apparently there\'s no mb_trim in the mb_* family, so I\'m trying to implement one for my own.

I recently found this regex in a comment in php.net:

Answer 1

You can also trim non-ascii compatible spaces (non-breaking space for example) on UTF-8 strings with preg_replace('/^\p{Z}+|\p{Z}+$/u','',$str);

\s will only match "ascii compatible" space character even with the u modifier.
but \p{Z} will match all known unicode space characters