php - Not able to retrieve $_POST values through ajax call -

I have a problem with Ajax. This is my code that I have done so far:

 < Code> & lt; Script src = "// ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js" & gt; & Lt; / Script & gt; & Lt; Script & gt; $ (Document) .ready (function () {getLocation ();}); Function getLocation () {if (navigator.jolocation) {navigator.geolocation.getCurrentPosition (showPosition); } And {warnings ("Geolocation is not supported by this browser."); }} Show show position (position) {latitude = position.coords.latitude; Longitude = position Calls. Lame; $ .post ({url: 'test.php', data: ({lat: latitude, long: longitude}), success: function (data) {warning ('done');}}); }   
  
 What I am trying to do is to call the function on the document and to get the value of the AJAX call on the same file Trying to get the script where I had called it Whenever I reload the page, I do not get any value:  
  print_r ($ _ POST ['lat']);   
 I do not know what the real problem is, I have already checked in the console and I have not found any errors. help please.   
 
 
 You need to successfully print callback to get the price  
  $ Post ({url: 'test.php', data: ({lat: latitude, long: longitude}), success: function (data) {warning (data);}});   
 and if you enter  
  if (isset ($ _ POST ['lat']) {print_r ($ _ POST ['lat' ];}   
 You will find a value in the warning box.  
  Edit : If reqest comes from Ajax using this, PHP can check in:  
  if ($ _SERVER ['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest') {if (isset ($ _ POST ['lat']) {print_r ($ _ POST ['lat']);} Exit ();}   
 If you keep it at the beginning, then you will see only  print_r  with a Ajax call.