抽象类传递对象

abstract class Employee{
protected $name;
function __construct($name){
$this->name = $name;
}
abstract function fire();
}

class Minion extends Employee{
function fire(){
echo $this->name.':i will clear my desk';
}
}

class NastyBoss{
private $employees = array();

function addEmployee($employeeName){
$this->employees[] = new Minion($employeeName);
}

function projectFails(){
if(count($this->employees)>0){
$emp = array_pop($this->employees);
$emp->fire();
}
}
}

$boss = new NastyBoss();
$boss->addEmployee('harry');
$boss->addEmployee('bob');
$boss->addEmployee('mary');
$boss->projectFails();

//会输出：mary:i will clear my desk