OOP Class can't close connection

[themonkey40]

I am trying to write a function that closes the connection created in the following class:

class dbConnect {
    
    function connect($dataB) {
        $conn=mysql_connect("127.0.0.1","username","password") or die (mysql_error());
        $db=mysql_select_db($dataB,$conn) or die ("Unable to connect to database1"); 
    }

        function closeConnect($conn) {
        mysql_close($conn);
    }
} 

to open a connection, I type:

$connection1-> new dbConnect();
$sql=$connection1->connect($dataB); 

I know the function closeConnect() isn't working. What will make it work?