Description:
------------
When defining some variables into a constructor, these ones are not "seen" when calling mysql-functions. For instance:

__construct ()
{
$db_host = "localhost";
$db_user = "akbara";
$db_pass = "";
}

public function db_routine ()
{
mysql_connect ($db_host, $db_user, $db_pass)
or die (mysql_error());
}
--------------
The error message is:
Warning: mysql_connect() [function.mysql-connect]: Access denied for user 'www-data'@'localhost' (using password: NO) in /home/akbara/server/localhost/www/fa.php on line 33
Access denied for user 'www-data'@'localhost' (using password: NO)
---------------
Defining the variables within the function db_routine () doesn't causes such an error.

The workaround of this problem:
using $this->var when defining the var within __construct () and then into mysql_function ($this->var). This is usually processed correctly.