by vijaya reddy.
Hello Rajaraman,
Use the following code in your client side php page.
<?php
$token = ' ';
$domainname = ' ';
$functionname = 'core_user_get_users_by_id';
$restformat = 'xml';
$userid=2; //here give value for userid
$params = array('userids' => array($userid));
header('Content-Type: text/plain');
$serverurl = $domainname . '/webservice/rest/server.php'. '?wstoken=' . $token . '&wsfunction='.$functionname;
require_once('curl.php');
$curl = new curl;
$restformat = ($restformat == 'json')?'&moodlewsrestformat=' . $restformat:'';
$resp = $curl->post($serverurl . $restformat, $params);
print_r($resp);