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Oct 23, 2024 am 12:44 AM

How to Access Protected Parent Class Variables in PHP Subclasses?

PHP?? ?? ??? ??? ???

?? ?? ??????? ?? ???? ?? ???? ??? ???? ?????. ??? ?? ??? ??? ?? ??? ??? ?? ????? ??? ??? ? ????.

??? B? ??? A? ???? ?? ?? ??? ?????.

<code class="php">class A {
    private $aa;
    protected $bb = 'parent bb';
    function __construct($arg) {}
    private function parentmethod($arg2) {}
}

class B extends A {
    function __construct($arg) {
        parent::__construct($arg);
    }
    function childfunction() {
        echo parent::$bb; //Fatal error: Undefined class constant 'bb' 
    }
}

$test = new B($some);
$test->childfunction();</code>

??:

? ? ?? echo parent::$bb; ???? ??? ?????? ?? ???? ?? ?? $bb? ??? ???? ? ????

??:

$bb? ??? A? protected ???? protected?? ??? ??? ?????. ??? parent:: ??? ???? ??? ?? ?? ??? ???? ?? ???? ? ????. ?? ?? ??? ???? $bb? ???? ? ????.

<code class="php">echo $this->bb;</code>

??:

$this ???? ?? ??? ?????. $bb? ??? B? ?? ???? ?? ??? ??? ??? $this? ???? ???? ? ????. ? ??? ??? ??? ?? ???? ??? ??? ????? ??????.

parent::

parent:: ??? ??? ?? ?????. ?? ??? ??? ?? ???? ???? ??? ??????. ????? ?? ???? ???? ?????? ??? ?? ??? ????? ??? ?????.

?? ?? ?? ??? ?????.

<code class="php">class Airplane {
    private $pilot;
    public function __construct( $pilot ) {
        $this->pilot = $pilot;
    }
}

class Bomber extends Airplane {
    private $navigator;
    public function __construct( $pilot, $navigator ) {
        $this->navigator = $navigator;
        parent::__construct( $pilot ); // Calls the parent constructor
    }
}</code>

? ?? Bomber ???? __construct() ???? ??? __construct() ???? ?????? ??? ?? ???? ??? ??? ??????.

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Video Face Swap

??? ??? AI ?? ?? ??? ???? ?? ???? ??? ?? ????!

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