Help with Create a public facing SETTER named "setSkills" that will accept an array and set the $skill property to that

<?php
//do not modify this file
class User {
    protected $name;
    protected $title;

    public function __construct($name = null, $title = null) {
        $this->name = $name;
        $this->title = $title;
    }

    public function __toString() {
        return $this->getSalutation();
    }

    public function getSalutation() {
        return $this->title . " " . $this->name;
    }

    public function getName() {
        return $this->name;
    }

    public function setName($name) {
        $this->name = $name;
    }

    public function getTitle() {
        return $this->title;
    }

    public function setTitle($title) {
        $this->title = $title;
    }
}

<?php

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


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

    }

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