PHP OOP 概念：类、对象和继承

<?php 

class employee {
  public $name;
  public $salary;

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

  public function getdetails() {
    echo "name: $this->name, salary: $this->salary";
  }
}

$manager = new manager();
$developer = new developer();

//inheritance 

class manager extends employee {
  public $department;

  public function __construct($name, $salary, $department) {
    parent::__construct($name, $salary);
    $this->department = $department;
  }

  public function getdetails() {
    parent::getdetails();
    echo ", department: $this->department";
  }
}

class developer extends employee {
  public $specialty;

  public function __construct($name, $salary, $specialty) {
    parent::__construct($name, $salary);
    $this->specialty = $specialty;
  }

  public function getdetails() {
    parent::getdetails();
    echo ", specialty: $this->specialty";
  }
}

// create objects
$manager = new manager("john doe", 80000, "marketing");
$developer = new developer("jane smith", 70000, "front-end");

// access properties and methods
echo "manager details: ";
$manager->getdetails();
echo "\n";
echo "developer details: ";
$developer->getdetails();

Manager Details: Name: John Doe, Salary: 80000, Department: Marketing
Developer Details: Name: Jane Smith, Salary: 70000, Specialty: Front-end