How call a function into event search submit button - jQGrid modal window?

Question

I need to use the option to search with custom php code but I could not put code because I've tried both and neither is as following

Answer 1

I want to use "single Searching", with php but I don´t know how to start.

I want to know if there is an event when there is click on the Search button to Single searching the modal window to send and receive parameters and php to be stored in the database.

I'm sorry my english is so bad!!!!! I Hope you understand Thaks's