kkk,
You will need to use some form of a storage engine.
You can store the results using files, such as ini, json, xml, yaml, etc (numerous technologies at your disposal) or MySQL.
You would save the values of the form, and after submission retrevieve the values.
I would suggest doing a search for "PHP Form Processing" and "PHP xml" and "PHP MySQL".
you will find tons of example code that will help point you in the right direction.