prevent php-warnings, closes #4124

Closes #4124

Merge request studip/studip!2969

2 files changed, 5 insertions, 3 deletions

diff --git a/lib/extern/ExternPage.php b/lib/extern/ExternPage.php
index 8ed0e96..d775bc4 100644
--- a/lib/extern/ExternPage.php
+++ b/lib/extern/ExternPage.php
@@ -138,7 +138,7 @@ abstract class ExternPage
             $extract[] = array_values(array_filter(array_map('trim', explode(' ', $one))));
         }
         foreach ($extract as $one) {
-            $return[$one[0]] = $one[1];
+            $return[$one[0]] = $one[1] ?? null;
         }
         return $return;
     }
@@ -236,7 +236,7 @@ abstract class ExternPage
         $allowed_params = $this->getAllowedRequestParams(true);
         $config_fields = $this->getConfigFields(true);
         foreach ($allowed_params as $param_name) {
-            $method = $config_fields[$param_name] ?: 'get';
+            $method = $config_fields[$param_name] ?? 'get';
             $param_value = Request::$method($param_name);
             if ($param_value) {
                 $this->setValue($param_name, $param_value);
@@ -342,6 +342,7 @@ abstract class ExternPage
     ): string {
         if (count($scopes) > 0) {
             $study_areas = StudipStudyArea::findMany($scopes);
+
             $scopes = [];
             if ($with_kids) {
                 foreach ($study_areas as $study_area) {
diff --git a/lib/extern/ExternPageTimetable.php b/lib/extern/ExternPageTimetable.php
index d427600..5d8dfd9 100644
--- a/lib/extern/ExternPageTimetable.php
+++ b/lib/extern/ExternPageTimetable.php
@@ -162,7 +162,7 @@ class ExternPageTimetable extends ExternPage
         $time = new DateTime();
         switch ($this->date_offset) {
             case 'start_date':
-                $time = DateTime::createFromFormat('d.m.Y', $this->date);
+                $time = $this->date ? DateTime::createFromFormat('d.m.Y', $this->date) : $time;
                 break;
             case 'current_semester':
                 $semester = Semester::findCurrent();
@@ -228,6 +228,7 @@ class ExternPageTimetable extends ExternPage
     protected function getContent()
     {
         $count = 0;
+        $date_content = [];
         foreach ($this->getDates() as $date) {
             $day = new DateTime();
             $day->setTimestamp($date->date)->setTime(0, 0);