PHP面向对象笔记 —— 117 继承概念

class Human {
private $height = 160;

public function cry() {
echo '5555<br >';
}
}

class Stu extends Human {
private $height = 170;
public $num = '00134';

public function cry() {
echo '59。。。<br >';
}

public function study() {
echo 'good good study, day day up<br >';
}
}

class Lawer extends Human {
private $height = '180';
public $area = '经济案件';

public function bianhu() {
echo '我的当事人是无罪的<br >';
}
}

$zhoukou = new Human();
$zhoukou->cry();

$xiaoming = new Stu();
$xiaoming->cry();
$xiaoming->study();

$liming = new Lawer();
$liming->cry();
$liming->bianhu();