fixed multiple things

public/ripristina_campo_lost.php

@@ -0,0 +1,26 @@
+<?php
+require_once('Connections/bkngstm.php');
+
+$conn = new mysqli($servername, $username, $password, $dbname);
+
+if ($conn->connect_error) {
+    die("Connessione fallita: " . $conn->connect_error);
+}
+
+if (isset($_POST['idbookingclass'])) {
+    $idbookingclass = $_POST['idbookingclass'];
+
+    $query = "UPDATE bookingclass SET lostlesson = 'N' WHERE idbookingclass = ?";
+    $stmt = $conn->prepare($query);
+    $stmt->bind_param("i", $idbookingclass);
+
+    if ($stmt->execute()) {
+        echo json_encode(['success' => true]);
+    } else {
+        echo json_encode(['success' => false, 'error' => $conn->error]);
+    }
+
+    $stmt->close();
+}
+
+$conn->close();