Hello.
I definitely have the same problem as this old discussion with no answers : https://moodle.org/mod/forum/discuss.php?d=350722
the difference is they use Soap, I use Rest
The function just returned "Null" with no exception error.
$user2enrol001 = array(
"roleid" => 5,
"userid" => 6,
"courseid" => 4
);
$user2enrol002 = array( "roleid" => 5, "userid" => 7, "courseid" => 4 );
$user2enrol003 = array( "roleid" => 5, "userid" => 8, "courseid" => 4 );
array_push($enrolments, $user2enrol001, $user2enrol002, $user2enrol003);
$json = $MoodleRest->request('enrol_manual_enrol_users', array("enrolments" => $enrolments));
echo $json;
Ce dernier echo affiche juste "Null"