note 27056 added to functions

Does anyone have a list of all the characters allowed in function names? So far I've only used a-z 0-9 _ and - I assume (), {}, [], ', ", $, % and & are not allowed. What other characters are legal and what aren't? -- http://www.php.net/manual/en/functions.php http://master.php.net/manage/user-notes.php?action=edit+27056 http://master.php.net/manage/user-notes.php?action=delete+27056 http://master.php.net/manage/user-notes.php?action=reject+27056