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PHP Extending Object-Oriented PHP Extending the Family Sibling Relationships

Posted by test ngu
.a{fill-rule:evenodd;}techdegree
test ngu
Full Stack JavaScript Techdegree Student 130 Points

I dont understand why my code errors please help me thanks

I write construct method for client class but it error occurred.

User.php 
<?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;
    }
}
Developer.php 
<?php
//do not modify this file
class Developer extends User 
{

  protected $skills;




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

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

  public function displayUserSkills() {
      return $this->getName() . ' has the following skills: ' . implode(", ", $this->skills);
  }
}
Client.php 
<?php
//add code for Client class
class Client extends User
{
  private $company;

  public function __construct($company){
    parent::__construct(null, null);
    $this->setCompany($company);
  }

  public function setCompany($company) {
    $this->company = $company;
  }

  public function getCompany() {
   return $this->company; 
  }
}