Please provide us your patch and we'll see.

you can rawurlencode the @ sign %40
username = xxx
password = yy@yy

dns = mysql://xxx:yy%40yy@localhost/mydb

If the dsn is to follow 'http url standards' (eg. the rfc), then there is no need to change the code.. (just need to document it somewhere)

Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. 

Thank you for your interest in PHP.

If your password contains non-alphanumeric characters do a urlencode() on the value before passing it if you are using the "mysql://foo:bar+@localhost/foo" format to pass data to DB::connect();