3、子类可以修改和调整父类定义的类成员
<?php
class Animal {
private $weight;
public function getWeight()
{
return $this->weight;
}
public function setWeight($w)
{
$this->weight = $w;
}
}
class Dog extends Animal
{
/**
*子类新增方法
*/
public function Bark()
{
echo "Wang~~Wang~~~ ";
}
}
$myDog = new Dog();
$myDog->setWeight(20);
echo "Mydog's weight is ".$myDog->getWeight().'<br>';
$myDog->Bark();
?>
每个人都需要一台速度更快、更稳定的 PC。随着时间的推移，垃圾文件、旧注册表数据和不必要的后台进程会占用资源并降低性能。幸运的是，许多工具可以让 Windows 保持平稳运行。
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