mysql_num_rows error

[Anon]

Supplied argument is not a valid MySQL result resource at line 33

30. connect();
31. $sql = \\"select * from user where user_username = \\'$username\\'\\";
32. $result = mysql_query($sql);
33. $row_count = mysql_num_rows($result);

[wchris]

Why do you made this \\? I would say this is the problem, so the query can´t get an valid result and so the num_rows can´t be counted.