jquery - How to pass parameters to php using get JSON -

i have json_data.php file , want pass parameter function inside switch statement using getjson.

<?php  require_once "db.php";  $db = new db();   if(isset($_get['method'])) {     switch (($_get['method'])) {        case 'getuserids':           echo json_encode($db -> getuserids());           exit();         case 'getuser':           echo json_encode($db -> getuser($userid) {           exit();           // other cases go here        case 'getcertcategories':           echo json_encode($db -> getcertcategories());           exit();         case 'get        default:           break;     }   } 

how pass parameter can pass $userid getuser function?

the second argument $.getjson object containing query parameters.

$.getjson('json_data.php', { method: 'getuserids' }, function(response) {     ... });  $.getjson('json_data.php', { method: 'getuser', userid: 'joe' }, function(response) {     ... }); 

in php, access $_get['method'], $_get['userid'], etc.