PHP5 inflector - camelize

Converts a word like "send_email" to "SendEmail". It will remove non aphanumeric character from the word, so "who's online" will be converted to "WhoSOnline"

Example:

 $word = 'send_email';
 echo str_replace(' ','',ucwords(preg_replace('/[^A-Z^a-z^0-9]+/',' ',$word)));

Result:

 SendEmail

php5 camelize inflector