/**
* Get the user's answers feedback.
*
* This function returns the feedback submitted by the teacher/admin
* during grading. Grading occurs manually or automatically.
*
* @since 1.7.5
* @access public
*
* @param int $lesson_id
* @param int $user_id
*
* @return false | array $answers_feedback{
* $type int $question_id
* $type string $question_feedback
* }
*/
public function get_user_answers_feedback($lesson_id, $user_id = 0)
{
$answers_feedback = array();
// get the user_id if none was passed in use the current logged in user
if (!intval($user_id) > 0) {
$user_id = get_current_user_id();
}
if (!intval($lesson_id) > 0 || 'lesson' != get_post_type($lesson_id) || !intval($user_id) > 0 || !get_userdata($user_id)) {
return false;
}
// first check the transient to save a few split seconds
$transient_key = 'sensei_answers_feedback_' . $user_id . '_' . $lesson_id;
$encoded_feedback = get_transient($transient_key);
// get the data if nothing was stored in the transient
if (empty($encoded_feedback) || !$encoded_feedback) {
$encoded_feedback = Sensei_Utils::get_user_data('quiz_answers_feedback', $lesson_id, $user_id);
//set the transient with the new valid data for faster retrieval in future
set_transient($transient_key, $encoded_feedback, 10 * DAY_IN_SECONDS);
}
// end if transient check
// if there is no data for this user
if (!is_array($encoded_feedback)) {
return false;
}
foreach ($encoded_feedback as $question_id => $feedback) {
$answers_feedback[$question_id] = base64_decode($feedback);
}
return $answers_feedback;
}
