PHP面向对象程序设计继承用法简单示例

<"<p>$this->name : ",self::$count," : parent : __construct</p>";
  }
  function work(){
    echo "<p>$this->name is working</p>";
  }
  
  function __destruct(){
    echo "<p>parent unset $this->name</p>";
  }
}
class Managers extends Employees{
  private $pos = null;
  function __construct($p,$nameStr){
    parent::$count++;
    parent::__construct($nameStr);
    $this->pos = $p;
    echo "<p>$this->name , $this->pos : self : __construct</p>";
  }
  function assignJob(){
    echo "<p>$this->name assign jobs</p>";
  }
  function getName(){
    return $this->name;
  }
  function __destruct(){
    echo "<p>self unset $this->name</p>";
  }
}
class Programmers extends Employees{
  function code(){
    echo "<p>$this->name is coding</p>";
  }
  function getName(){
    return $this->name;
  }
}
$e1 = new Employees('e1');
$e2 = new MAnagers(2,'e2');
$e3 = new Programmers('e3');
$e1->work();
$e2->work();
$e3->work();
$e2->assignJob();
$e3->Code();
echo "<p>{$e3->getName()}</p>";
//echo "<p>$e1->name</p>";
if($e2 instanceof Employees){
  echo "<p>ok</p>";
}else{
  echo "<p>no</p>";
}
unset($e1,$e2,$e3);