update to use single html with dynamic div

php/get_restaurant_tiers.php

@@ -0,0 +1,37 @@
+<?php
+include 'db_connection.php';
+
+// Fetch restaurants and their median scores
+$stmt = $db->prepare("
+    SELECT
+        r.id,
+        r.name,
+        ROUND(MEDIAN(b.bewertung)) AS median_score
+    FROM Restaurant r
+    LEFT JOIN Bewertung b ON r.id = b.fk_restaurant_id
+    GROUP BY r.id, r.name
+    ORDER BY median_score DESC NULLS LAST
+");
+$stmt->execute();
+$restaurants = $stmt->fetchAll(PDO::FETCH_ASSOC);
+
+$tiers = [];
+foreach ($restaurants as $restaurant) {
+    $score = $restaurant['median_score'];
+    if ($score >= 9) {
+        $tiers['S'][] = $restaurant;
+    } elseif ($score >= 7) {
+        $tiers['A'][] = $restaurant;
+    } elseif ($score >= 5) {
+        $tiers['B'][] = $restaurant;
+    } elseif ($score >= 3) {
+        $tiers['C'][] = $restaurant;
+    } elseif ($score >= 1) {
+        $tiers['D'][] = $restaurant;
+    } else {
+        $tiers['Unrated'][] = $restaurant; // For restaurants with no reviews
+    }
+}
+
+echo json_encode($tiers);
+?>