$ curl 'http://localhost/moodle/webservice/rest/server.php?wstoken=thetoken&wsfunction=moodle_user_get_users_by_id&userids\[0\]=3'

<?xml version="1.0" encoding="UTF-8" ?>
<RESPONSE>
<MULTIPLE>
<SINGLE>
<KEY name="id"><VALUE>3</VALUE>
</KEY>
<KEY name="fullname"><VALUE>No&euml;l Smith</VALUE>
</KEY>
<KEY name="firstaccess"><VALUE>1309896694</VALUE>
</KEY>
<KEY name="lastaccess"><VALUE>1309967672</VALUE>
</KEY>
<KEY name="auth"><VALUE>manual</VALUE>
</KEY>
<KEY name="confirmed"><VALUE>1</VALUE>
</KEY>
<KEY name="idnumber"><VALUE></VALUE>
</KEY>
<KEY name="lang"><VALUE>en</VALUE>
</KEY>
<KEY name="theme"><VALUE></VALUE>
</KEY>
<KEY name="timezone"><VALUE>99</VALUE>
</KEY>
<KEY name="mailformat"><VALUE>1</VALUE>
</KEY>
<KEY name="description"><VALUE></VALUE>
</KEY>
<KEY name="descriptionformat"><VALUE>1</VALUE>
</KEY>
<KEY name="city"><VALUE>Anywhere</VALUE>
</KEY>
<KEY name="country"><VALUE>US</VALUE>
</KEY>
<KEY name="profileimageurlsmall"><VALUE>http://localhost/moodle/pluginfile.php/14/user/icon/f2</VALUE>
</KEY>
<KEY name="profileimageurl"><VALUE>http://localhost/moodle/pluginfile.php/14/user/icon/f1</VALUE>
</KEY>
<KEY name="enrolledcourses"><MULTIPLE>
<SINGLE>
<KEY name="id"><VALUE>2</VALUE>
</KEY>
<KEY name="fullname"><VALUE>quiztest</VALUE>
</KEY>
<KEY name="shortname"><VALUE>quiztest</VALUE>
</KEY>
</SINGLE>
</MULTIPLE>
</KEY>
</SINGLE>
</MULTIPLE>
</RESPONSE>