send and receive json data from jquery , php

Question

I working on google sign in with JavaScript , if user signed in with google I will get his basic information as json data and send this data to php script , this script will insert user into my sql database but I don't know how can I retrieve json data which is sending by jquery in php this is my jquery code

  function update_user_data(response) 
  {
 var dataString = JSON.stringify(response);

alert(dataString);

  $.ajax({
        type: "POST",
        dataType: 'json',
        data: {myData:response},
        url: 'Save.php?id=check_user',
        success: function(msg) {var msgs=JSON.stringify(msg);
        alert(msg);
    //  var array = msg.split(',');
    //  var email =array[0];alert(email);
   //var password = array[1];alert(password);
   //$('#username').val(email);$('#password').val(password);
 // document.getElementById("modal4c").click();
        },
           error: function(msg) {alert(JSON.stringify(msg));
    alert(msg);

        }
  });
 }

you can see that I send the json string to Save.php?id=check_user

here is th save.php code

$obj = $_POST['myData'];

echo $obj['id'];

the json data which I send by javascript is like this

"{\"kind\":\"plus#person\",\"etag\":\"\\\"EhMivDE25UywestNG8tqFM2v- 
 A/ExECAGokGQl1532fQP_aRYY\\\"\",\"gender\":\"male\",\"emails\": 
 \"objectType\":\ 
"person\",\"id\":\"23229164823262432640\",\"displayName\":\"mohamad 
 buvaydanı\",\"name\":{\"familyName\":\"buvaydanı\",\"givenName\":\"mohadmad\"},\"url\":\"https://plus.google.com/1128891s326438205624449640\",\"image\"

}

but the php script reply with "{" message only

Answer 1

There is not id in your data. you passing data: {myData:response}, only. your data should be like data: {id:123, myData:response}, and you have to decode it first in php file because it is json format, not array. json_decode($_POST, true);