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I would like to secure user input, if it is text input we can simply use filter_input and mysql_real_escape_string.
My question is: Do I have to use those when variables are coming from a select box? Is it possible for some crafty user to change POST values from the browser?
My select box is populated dynamically from a database. Do I still have to compare recevied data (after submit) with the database, and use mysql_real_escape_string for safety?
Absolutely, you need to confirm all data you get from the client, always.