使用jQuery的AJAX将JSON发送到PHP文件

Question

consider:
I've collected form data and want to make a JSON object. then send that object to php, which is going to decode it, using json_decode().
How is that possible?

A,B,C,D are form data.

var formData = [{"task": A , "due_time": due_B, "due_date" : C , "priority": D}];

$.ajax({url: someplace.php , type: "post" , data: formData});

In PHP : I want to check

if isset($_POST['formData']){ $data = json_decode($_POST['formData'])}

Answer 1

Create valid JS object:

[jQuery]
var obj = {task: "A", due_time: due_b, /*...*/};

$.ajax({
   url: '#',
   type: 'post',
   data: obj
});

All sent values are located in $_POST global.

[PHP]
if (isset($_POST['task']) && $_POST['task'] == 'A') {
    $startApocalypse = true;
}