1
无法解释为什么会打印“\ n1”。私有财产不能被继承。这就是为什么构造函数应该设置新定义的public proverty的值,但“print $ b-> number”不打印任何内容,而“$ b-> printNumber()”打印“1”。在PHP中覆盖私有财产
class A
{
private $number;
public function __construct($number)
{
$this->number = $number;
}
public function printNumber()
{
print $this->number;
}
}
class B extends A
{
public $number;
}
$b = new B(1);
print $b->number;
print "\n";
$b->printNumber();