function dailyCohortActiveStudents($threshold, $start_time, $end_time)
{
$conn = new mysqli("localhost", "root", "admin", "moodledb");
if ($conn->connect_errno) {
echo "failed to connect to mysql:(" . $conn->connect_errno . ") " . $mysql->connect_error;
}
$code = "select id,name from mdl_cohort;";
$resp = $conn->query($code);
$name_map = array();
$namelist = array();
while ($row = $resp->fetch_assoc()) {
$name_map[$row['id']] = convert_name($row['name'], $namelist);
}
$code = "select " . "l.userid, l.timecreated, cm.cohortid " . "from " . "mdl_logstore_standard_log l,mdl_cohort_members cm, mdl_role_assignments r " . "where " . "l.userid=cm.userid and r.userid = l.userid " . "and r.roleid=5 order by l.timecreated asc;";
$resp = $conn->query($code);
$days = array();
$days[$start_time] = createEmptyCohortList($name_map);
$next_day = $start_time + 86400;
$day_rec = array();
while ($row = $resp->fetch_assoc()) {
// $key = convert_name($row['name'],$namelist);
while ($row['timecreated'] > $next_day) {
// aggregate
$days[$start_time] = createEmptyCohortList($name_map);
//create a new thingy for today's aggregation
foreach ($day_rec as $insti) {
if ($insti != null) {
foreach ($insti as $usrCount) {
if ($usrCount >= $threshold) {
$days[$start_time][$name_map[$row['cohortid']]] += 1;
}
}
}
}
//iterate
$start_time = $next_day;
$day_rec = createEmptyCohortList($name_map);
//print_r($day_rec);
$next_day += 86400;
}
// if(isset($day_rec[$row['cohortid']]))
// print_r( $day_rec[$row['cohortid']]);
if (!isset($day_rec[$row['cohortid']])) {
echo "--------being set------\n";
// $day_rec[$row['cohortid']] = array($row['userid'] => 0);
// $day_rec[$row['cohortid']] = [$row['userid'] => 0];
// $day_rec[$row['cohortid']][$row['userid']] = 0;
}
// echo '---'.$day_rec[$row['cohortid']][$row['userid']].'---';
$day_rec[$row['cohortid']][$row['userid']] = $day_rec[$row['cohortid']][$row['userid']] + 1;
//$days[$start_time][$name_map[$row['cohortid']]] += 1;
}
//$return_obj['column_names'] = ['institutions','values'];
//$return_obj['values'] = $days;
//echo json_encode($return_obj);
}
function dailyLTI($start_time, $end_time)
{
global $DB;
$code = "select id,name from mdl_cohort;";
$name_map = array();
$namelist = array();
$result = $DB->get_records_sql($code, null);
foreach ($result as $row) {
// while ($row = $resp->fetch_assoc()) {
$name_map[$row->id] = convert_name($row->name, $namelist);
}
$code = "select " . "l.timecreated, cm.cohortid " . "from " . "mdl_logstore_standard_log l,mdl_cohort_members cm, mdl_role_assignments r " . "where " . "l.userid=cm.userid and r.userid = l.userid " . "and l.component = 'mod_lti' " . "and r.roleid=5 order by l.timecreated asc;";
$result = $DB->get_records_sql($code, null);
$days = array();
$days[$start_time] = createEmptyCohortList($name_map);
$next_day = $start_time + 86400;
foreach ($result as $row) {
while ($row->timecreated > $next_day) {
$start_time = $next_day;
$days[$start_time] = createEmptyCohortList($name_map);
$next_day += 86400;
}
$days[$start_time][$name_map[$row->cohortid]] += 1;
}
$return_obj['column_names'] = ['institutions', 'values'];
$return_obj['values'] = $days;
echo json_encode($return_obj);
}