What is wrong with this code?

  <?php
    class Vehicle {
      public function honk() {
        return "HONK HONK!";
      }
    }
    // Add your code below!
    class Bicycle extends Vehicle{
       public funciton honk() {
          return "Beep beep!";
       }
    }
     $bicycle = new Bicycle();
     echo $bicycle->honk();
  ?>