Why var_dump($_POST); returns an empty array?

Question

PHP

Here's what the browser returns to me:
With this JavaScript code:

$(function() {
  var data = ($("#json").html());
  console.log(data);
  $.ajax({
    type:'POST',
    url: '../index.php',
    data: {data: data},
    success: function(){
      alert('Успех!');
    }
  });
});

Answer 1

And here is console.log(data); what ?

Answer 2

to start - var data = 10; and check if the value arrives. php code also does not hurt, otherwise guessing on logs without code does not work.
UPD: visually there are no errors in the code, it is difficult to say what specifically violates the script. How do you get, by the way, wardump, ajax then? in the parsing error network console? Try dumping $_REQUEST, nothing else comes to mind, except for non-obvious bugs, server settings and incorrect paths.

Answer 3

var_dump where do you write? I see only js in your code