In the Developer.php file, add a Developer class that is a child of the User class

<?php
//do not modify this file
class User {
class Developer extends User 
{
  protected $skills = array();
  protected $name;

  public function getSkills(){
    return $this->skills;
  }
  public function setSkills($skill){
    $this->skills = $skill;  
  }
  public function displayUserSkills(){
    $name = $this->name;
    $userSkills = implode(', ', $this->skills);
    return "$name has the following skills: $userSkills";
  }
}

<?php

//add new child class here
 class Developer extends User 
 { 
   protected $skills = array();

public function getSkills() 
{
  return $this->skills;
}

public function setSkills($skills) 
{ 
  $this->skills = $skills;
}
}