Sending JSON via XHR using the POST method - how to accept and parse?

Question

PHP

Good day. I'll get right to the point - There is an XMLHttpRequest written in pure JS:

var r = new XMLHttpRequest();
  r.open("POST", "model.php");
  r.setRequestHeader("Content-Type", "application/json");
  r.send("req="+json);

Which sends a piece of JSON'a of the following form: Problems begin at the level of the PHP script, when the code: - says that the variable is empty - that is, the request went and even seemed to come, but the variable remained empty and had nothing at the zero index. Accordingly, there is no access to data and will not be. As evidence, an error of the form is attached:

{"name":"username", "email":"usermail" }


var_dump(json_decode($_POST["req"]));

Notice: Undefined index: req in ...
NULL

Tell me what and how to fix it so that this magic starts to work.
Thanks in advance.)

Answer 1

www.stackoverflow.com/a/8945912
$entityBody = file_get_contents('php://input');

Answer 2

I did the following based on your advice:

$req =  json_decode(file_get_contents("php://input"));
echo $req -> name; # Выведет то, что должно. Работает.)

Happy as a child.
Thanks a lot for your help.)