title: Only few values don't get inserted to the database
body: <p>I have just little experience in php. I have a php interface which has forms that are used to enter data to the tables in my "mysql" database. But, when i enter data via the forms, some data values are not get inserted to the database. particularly they are primary key values. other values are get inserted without any problems. i checked corresponding variables with 'var_dump' and values are empty. i tried in many ways and checked in this site also. but,still couldn't get a solution. i'm working with phpMyadmin.
   i appreciate your help and thank you in advance.</p>