>> Db error: Access denied for user 'www-data'@'localhost' (using password: NO)

>> WTF? I´m not using a user called www-data for MySQL connections, but apache 
>> runs as this user

in the case where $test is true there is an open mysql connection, but
when $test is false there is no open connection is  available. may be
you have opened a connection when $test is true or used a
mysql_close() when $test is false or when $_SESSION['login']['uid'] is
set.

regarding www-data, when mysql_query() fails to find a valid MySql
connection, it tries to open a new connection with mysql.default_user
and mysql.default_password (u can see these values trough phpinfo());
http://php.net/manual/en/function.mysql-connect.php

this used to be the behavior earlier, seems it was changed from PHP > 5.3.0

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