drupal-exercise.php

#!/usr/bin/env php
<?php

class Person
{
    public $first_name;
    public $last_name;

    public function getFullName()
    {
        return $this->first_name . " " . $this->last_name;
    }
}

class Employee extends Person
{
    public $title;
    public static function printTitle(Employee $employee)
    {
        echo $employee->title;
    }
}

class Intern extends Person
{
    const TITLE = "Intern";
    public static function printTitle()
    {
        echo static::TITLE;
    }
}

class Supervisor extends Employee
{
    protected $employees = array();

    public function getEmployees()
    {
        return $this->employees;
    }

    public function addEmployee(Employee $employee)
    {
        foreach (array_keys($this->employees) as $index) {
            if ($this->employees[$index] == $employee) {
                return false;
            }
        }
        $this->employees[] = $employee;
    }

    public function removeEmployee(Employee $employee)
    {
        foreach (array_keys($this->employees) as $index) {
            if ($employee == $this->employees[$index]) {
                unset($this->employees[$index]);
            }
        }
    }
}


$person = new Person();
$person->first_name = "First";
$person->last_name = "Last";

echo $person->getFullName() . "\n";

$employee = new Employee();
$employee->first_name = "First";
$employee->last_name = "Last";
echo $employee->getFullName() . "\n";
$employee->title = "Senior Executive Vice President";

$employee::printTitle($employee);
echo "\n";

$intern = new Intern();
$intern->first_name = "First";
$intern->last_name = "Last";
echo $intern->getFullName() . "\n";
$intern::printTitle($intern);
echo "\n";


$supervisor = new Supervisor();
$intern->first_name = "First";
$intern->last_name = "Last";
$supervisor->addEmployee($employee);
// $supervisor->addEmployee($intern);
var_dump($supervisor->getEmployees());
$supervisor->removeEmployee($employee);
var_dump($supervisor->getEmployees());