PHP returning JSON to JQUERY AJAX CALL

I am still struggling to get my head around the ins and out of JQUERY, AJAX and PHP.I can now call the PHP OK, process the form elements and send an email, but I am not handling the return to the AJAX....

Strategy for handling variable time queries?

I have a typical scenario that I’m struggling with from a performance standpoint. The user selects a value from a dropdown and clicks a button. A stored procedure takes that value as an input parameter,...