For a login system in php would this be a suitable outline of how it would work:

users types in username and password, clicks login button.

1. Checks if user exists in database,
2. if it does, then retrieve the salt for that user
3. hash the password and salt (would this be done on the client or server side? I think client side would be better, but php is server side so how would you do this?)
4. check value against value in database,
5. if the values match then user has typed in correct password and they are logged in.