Lines Matching refs:null
16 * @param string|null $user Username, null for no user data
19 public function getLessons($user = null)
25 if ($user !== null) {
58 if ($user === null) return false;
111 * @param null|string $user When user is given, next unseen lesson is returned
114 public function getNextLesson($id, $user = null)
125 if ($user !== null && $all[$keys[$i]] !== 0) {
139 * @param null|string $user When user is given, previous unseen lesson is returned
142 public function getPrevLesson($id, $user = null)
152 if ($user !== null && $all[$keys[$i]] !== 0) {
207 if ($instructions === null) return [];