I feel that PHP classes are really useless

[Jeff_Mott]

@ulthane

My thought was to create objects from SQL when a user enter the site for the first time and store them somehere for a certain amount of time (like in sessions for 20 minutes), then whenever he reloads the page or go to a page that uses the same objects they’ll just get loaded from the session without the need for another SQL query

Sounds like caching is what you need.