php - AJAX value sending error -

hi have problems script below. problem think lies on data need sent php via ajax.

jquery

$('.send').live("click", function(){      $.ajax({          url:'foobar.php',         type:'post',         data: 'id=' + $(this).attr('id'),         datatype:'json',         contenttype: 'application/json; charset=utf-8',         success: function(data) {              switch (data.status)             {                 case "a":                      alert(data.text);                      break;                  case "b":                      alert(data.text);                      break;                  }             },         error: function(xmlhttprequest, textstatus, errorthrown) {              alert ("error: "+textstatus);              }         })     } 

and, php

$id = $_request['id'];  switch ($id) {      case "foo":          $data["status"] = "a";         $data["text"] = "foo-foo";         echo json_encode($data);          break;      case "bar":          $data["status"] = "b";         $data["text"] = "bar-bar";         echo json_encode($data);          break;      } 

but, if this

//data: 'id=' + $(this).attr('id'), 

and change this

$id = 'foo'; 

the script work fine. need make both script above can work? in advance.

i put comment answer.

apart using deprecated jquery api, others didn't point out following:

what doing in below line:

contenttype: 'application/json; charset=utf-8', 

is promising server http entity json-string, not case. usual percentile-encoded string. (a=b&c=d&e=f).

if remove line, browser sends default value content-type application/x-www-url-form-encoded. trigger php parse http entity such , give $_request array populated.