params fix

src/buy_chocolate.php

@@ -37,12 +37,12 @@ if($_SERVER["REQUEST_METHOD"] === "POST"){
     $pdo = $connect_db();
     $stmt = $pdo->prepare($sql);
 
-    $stmt->bindParams(':username', $username);
-    $stmt->bindParams(':chocolate_id', $chocolate_id);
-    $stmt->bindParams(':amount', $amount);
-    $stmt->bindParams(':totalprice', $totalprice);
-    $stmt->bindParams(':address', $address);
-    $stmt->bindParams(':time', $time);
+    $stmt->bindParam(':username', $username);
+    $stmt->bindParam(':chocolate_id', $chocolate_id);
+    $stmt->bindParam(':amount', $amount);
+    $stmt->bindParam(':totalprice', $totalprice);
+    $stmt->bindParam(':address', $address);
+    $stmt->bindParam(':time', $time);
 
     $stmt->execute();