Getting $_POST not working after Ajax successful submit in same page - php

Question

I create a Form after user click on a div, and I submit on same page using Ajax without reloading page.
I see that the form is submitted successfully with data when I check the network tab in dev tools but when I print $_POST or check if isset($_POST["data"]), I get $_POST is empty and the if condition is false, is there any way to get the data in PHP ($_POST) without refreshing the page.
I get no errors in console or php
When using:
form.submit();
The form is submitted and I get $_POST but the page reload, this is why I need to use Ajax
My code on Js page :
function post(path, parameters) {
var form = $('<form id="form"></form>');
form.attr("method", "post");
form.attr("action", path);
$.each(parameters, function(key, value) {
var field = $('<input></input>');
field.attr("type", "hidden");
field.attr("name", key);
field.attr("value", JSON.stringify(value));
form.append(field);
form.append(data);
});
$(document.body).append(form);
$.ajax({
type: "POST",
url: path,
data: $("#form").serialize(),
success: function(data) {
$('.before').hide();
$('.next').show();
}
});
return false;
}
$('.card-container').on('click',function(e){
e.preventDefault();
var page = window.location.href;
var object = {
'array': [
['string1', 'string2'],
['string3', 'string4']
]
};
post(page, object);
});
My code on PHP page :
var_dump($_POST);
if (isset($_POST['array'])) {
$array = json_decode($_POST['array'], true);
print_r("ok");
}
The full code is too long to include it here.