Can't Getting Data From Ajax POST (php)

the problem is in the contentType, change like this

Ajax:

var input1 = $('#input1').val()
var input2 = $('#input2').val()
var jsonData = {input1: input1, input2: input2}
$.ajax({
    url: serviceUrl,
    type: "POST",
    dataType: "json",
    data: jsonData,
    contentType: "application/x-www-form-urlencoded"
});

 

and then try to print request

PHP:

<?php

print_r($_POST);