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$user = User::getByUserID(3); // Retrieve the user object for the user with the ID of 3.
$groups = $user->getUserGroups();
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if ($u->isRegistered()) {
print 'User is logged in.';
}
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$groups = $u->getUserGroups();
foreach($groups as $groupID) {
$group = \Concrete\Core\User\Group\Group::getByID($groupID);
print $group->getGroupName();
}
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User::getByUserID(3, true); // Now user 3 is logged in.
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$andrew = UserInfo::getByName('andrew');
$jane = UserInfo::getByEmail('jane@concretecms.org');