PHP類設計問題

Question

我正在嘗試編寫類以在我的技能測試中顯示一些人。其中一個問題如下：

顯示孩子如何稱呼父母的方法。顯示重載如何工作。指示類變量的語法。

我想我得到了大部分的問題做，但不知道是什麼指示類變量的意思 ...有人能解釋一下我的語法？非常感謝！

Class Phone{ 

function __construct(){ 
    echo "This is the constructor"; 
} 

protected function feature(){ 
    echo "Communication <br>"; 
} 
} 

Class CellPhone extends CordlessPhone { 
    private $brand; 
    function __construct(){ 
    echo "<p style='color:red;'>Cell phone feature:</p>"; 
    } 

    function __set($b, $value){ 
    if($value=="Apple"){ 
    $this->brand=$value." is awesome!"; 
    }elseif($value=="LG"){ 
    $this->brand=$value." is nice"; 
    }else{ 
    $this->brand="We only accept Apple and LG"; 
    } 
    } 

    function __get($brand){ 
    return "The brand: ".$this->brand."------"; 
    } 

    public function feature(){ 
    parent::feature(); 
    echo "Play music<br>"; 
    echo "Surf internet<br>"; 
    } 
} 

Class CordlessPhone extends Phone { 
    function __construt(){ 
    echo "<p style='color:red;'>Cordless phone feature:</p>"; 
    } 
    public function feature(){ 
    parent::feature(); 
    echo "Cordless<br>"; 
    echo "Use Battery<br>"; 
    } 
} 

$phone=new CellPhone(); 
$phone->feature(); 
$phone->brand="LG"; 
echo $phone->brand; 

Answer 1

我認爲它們是指類變量作爲該類的屬性。

class A { 
    private $b = TRUE; // This is the syntax for setting visibility, name and default value 

    public function __construct() { 
     echo $this->b; // this is how to access from within a method 
    } 

}