add search functionality

webseite/search.php

@@ -0,0 +1,40 @@
+<?php
+require_once("classes/SubjectData.php");
+require_once("classes/TopicData.php");
+
+if (!isset($_GET['query'])) {
+    die(json_encode([]));
+}
+
+$query = strtolower(trim($_GET['query']));
+$subjects = SubjectData::getAll();
+$results = [];
+
+foreach ($subjects as $subject) {
+    if (strpos(strtolower($subject->displayName), $query) !== false) {
+        $results[] = [
+            'type' => 'subject',
+            'id' => $subject->id,
+            'displayName' => $subject->displayName
+        ];
+    }
+    foreach ($subject->topics as $topic) {
+        if (
+            strpos(strtolower($subject->displayName), $query) !== false ||
+            strpos(strtolower($topic->displayName), $query) !== false ||
+            strpos(strtolower($topic->description), $query) !== false ||
+            strpos(strtolower($topic->article), $query) !== false
+        ) {
+            $results[] = [
+                'type' => 'topic',
+                'subjectId' => $topic->subjectId,
+                'id' => $topic->id,
+                'displayName' => $subject->displayName . ' - ' . $topic->displayName
+            ];
+        }
+    }
+}
+
+header('Content-Type: application/json');
+echo json_encode($results);
+?>