POST array empty on jQuery AJAX call

Question

I hesitate to ask, as there are numerous other posts on this topic (one and two for example), but none of the solutions in those posts seem to apply to me.

I am trying to pass a JSON-encoded object from a page to a PHP controller, and then respond back with some information.

If I watch in Firebug, I can see the object being sent under the 'Post' tab, however when I print out the $_GET, $_POST, and $_REQUEST arrays I see nothing at all regarding the json object. The $_GET array at least shows my querystring of 'update-player', however POST is empty and REQUEST only shows some local cookies I have.

Here is my jQuery code. As you can see I'm hardcoding the JSON at the moment, and the intention is that I will have a jQuery method updating the local object.

function sendPlayerUpdate(row, col) {
    var playerinfo = [
        {
          "id": 1,
          "row": row,
          "col": col
        }
      ];

        alert(playerinfo[0].id); //debugging

    $.ajax({
        type: 'POST',
        url:"controller.php?a=update-player",
        //data: $.toJSON(playerinfo[0],
        data: { json: JSON.stringify(playerinfo) },
        contentType: "application/json",
        success: function (){

        },
        dataType: 'json'
      });
 };

My corresponding PHP code handling the request:

// update player information from AJAX POST
case "update-player":
  if (isset($_POST['json'])) echo "json received\n\n";
  else echo "json not received\n\n";
  echo "GET VARIABLES\n";
  print_r($_GET);
  echo "\n\nPOST VARIABLES\n";
  print_r($_POST);
  echo "\n\nREQUEST VARIABLES\n";
  print_r($_REQUEST);

And, what I see in Firebug:

Firebug output json not received

GET VARIABLES
Array
(
    [a] => update-player
)


POST VARIABLES
Array
(
)


REQUEST VARIABLES
Array
(
    [a] => update-player
    (local cookies)
)

GBD · Accepted Answer · 2012-10-21 17:51:05Z

5

Try in PHP as below (When request is an application/json, then you will not get data into $_POST)

var_dump(json_decode(file_get_contents("php://input")));

answered Oct 21, 2012 at 17:51

GBD

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2 Comments

GBD Over a year ago

due to application/json, your json passing in body request

erik Over a year ago

ahhh, makes sense...so i can just pull that into a local object and work from there. thanks!

Aman Chhabra · Accepted Answer · 2012-10-21 17:46:47Z

0

Try this May be it will work for you

 $.ajax({
type: 'POST',
url:"controller.php?a=update-player",
data: data_json=JSON.stringify(playerinfo),
success: function (data){
},
});

answered Oct 21, 2012 at 17:46

Aman Chhabra

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3 Comments

erik Over a year ago

Tried that, however the $_POST array is still empty.

Aman Chhabra Over a year ago

can you please again post the PHP code and have you used $_POST['data_json']?

erik Over a year ago

See accepted answer...I'm just going to read from the raw input data. Thanks though!

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