PHPオブジェクト指向プログラミングビデオ資料共有

<? php
classConstructTest {
    private $arg1;
    private $arg2;
    public function __construct($arg1, $arg2) {
        $this->arg1 = $arg1;
        $this->arg2 = $arg2;
        print "__construct is called...\n";
    }
    public function printAttributes() {
        print &#39;$arg1 = &#39; . $this->arg1 . &#39; $arg2 = &#39; . $this->arg2 . "\n";
    }
}
$testObject = new ConstructTest("arg1", "arg2");
$testObject->printAttributes();

<? php
classBaseClass {
    protected $arg1;
    protected $arg2;
    function __construct($arg1, $arg2) {
        $this->arg1 = $arg1;
        $this->arg2 = $arg2;
        print "__construct is called...\n";
    }
    function getAttributes() {
        return &#39;$arg1 = &#39; . $this->arg1 . &#39; $arg2 = &#39; . $this->arg2;
    }
}
class SubClass extends BaseClass {
    protected $arg3;
    function __construct($baseArg1, $baseArg2, $subArg3) {
        parent::__construct($baseArg1, $baseArg2);
        $this->arg3 = $subArg3;
    }
    function getAttributes() {
        return parent::getAttributes() . &#39; $arg3 = &#39; . $this->arg3;
    }
}
$testObject = new SubClass("arg1", "arg2", "arg3");
print $testObject->getAttributes() . "\n";