MDL-30085 core get _grades

client_grades.php

<?php
// This file is NOT a part of Moodle - http://moodle.org/
//
// This client for Moodle 2 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//

/// SETUP - NEED TO BE CHANGED
//
// Student token
$studenttoken = '200283ba9395030324317216862ae274';

// Teacher Token.
$teachertoken = '298dee2e40eeac025a642e6231599917';

$domainname = 'http://localhost/moodlebugs';
//$domainname = 'http://localhost/m/stable_24';

$courseid = 2;
// Student id.
$userid = 3;
// the cmid
$activityid = 56;

// REST RETURNED VALUES FORMAT
$restformat = 'json'; //Also possible in Moodle 2.2 and later: 'json'
                     //Setting it to 'json' will fail all calls on earlier Moodle version

$restformat = ($restformat == 'json')?'&moodlewsrestformat=' . $restformat:'';

/// REST CALL
header('Content-Type: text/plain');
require_once('./curl.php');
$curl = new curl;

$functionname = 'core_grades_get_grades';
$params = array(
 'courseid' => $courseid,
 'component' => 'mod_assign',
 'activityid' => $activityid,
 'userids' => array($userid)
 );
$serverurl = $domainname . '/webservice/rest/server.php'. '?wstoken=' . $studenttoken . '&wsfunction='.$functionname;
$resp = $curl->post($serverurl . $restformat, $params);
$resp = json_decode($resp);

echo "Current grade is: " . $resp->items[0]->grades[0]->grade;
echo "\n\n\n\n";

$newgrade = rand(0, 100);
echo "Updating current grade to $newgrade (random(0, 100))";
echo "\n\n\n\n";

$functionname = 'core_grades_update_grades';
$params = array(
 'source' => 'mod/assign',
 'courseid' => $courseid,
 'component' => 'mod_assign',
 'activityid' => $activityid,
 'itemnumber' => 0,
 'grades' => array(
    array('studentid' => $userid,
            'grade' => $newgrade)
  )
 );
$serverurl = $domainname . '/webservice/rest/server.php'. '?wstoken=' . $teachertoken . '&wsfunction='.$functionname;
$curl->post($serverurl . $restformat, $params);

echo "Grade updated";
echo "\n\n\n\n";

echo "Retrieving grade again to check if matches the new grade ($newgrade)";
echo "\n\n\n\n";


$functionname = 'core_grades_get_grades';
$params = array(
 'courseid' => $courseid,
 'component' => 'mod_assign',
 'activityid' => $activityid,
 'userids' => array($userid)
 );
$serverurl = $domainname . '/webservice/rest/server.php'. '?wstoken=' . $studenttoken . '&wsfunction='.$functionname;
$resp = $curl->post($serverurl . $restformat, $params);
$resp = json_decode($resp);

$grade = $resp->items[0]->grades[0]->grade;
echo "Grade retrieved is: " . $grade;
echo "\n\n\n\n";

if ($grade == $newgrade) {
    echo "OK it worked!! Thanks for testing";
} else {
    echo "Wow, something failed!! Thanks for testing";
}

For moodle 2.9:

$params = [
	'wsfunction' => 'core_grades_get_grades',
	'moodlewsrestformat' => $format,
	'userids[0]' => 1345, # ID user
	'courseid' => 313 # ID Course,
	# 'component' => 'mod_assign'
];