仅当$ user不相等时才出现错误消息

I have the following code which correctly assigns sessions if both arguments re true (ie. username and password match database record). If the username and password don't match the database I want to echo out a message to the user. However, the message only echo's out if the username doesn't match. If the password doesn't match but the username does, no error message but also no session?I have the following code which correctly assig