附代码:
<?php
/**
* parent 只能调用父类中的公有或受保护的方法,不能调用父类中的属性
* self 可以调用父类中除私有类型的方法和属性外的所有数据
*/
class User{
public $name;
private $passwd;
protected $email;
public function __construct(){
//print __CLASS__." ";
$this->name= 'simple';
$this->passwd='123456';
$this->email = 'bjbs_270@163.com';
}
public function show(){
print "good ";
}
public function inUserClassPublic() {
print __CLASS__.'::'.__FUNCTION__." ";
}
protected function inUserClassProtected(){
print __CLASS__.'::'.__FUNCTION__." ";
}
private function inUserClassPrivate(){
print __CLASS__.'::'.__FUNCTION__." ";
}
}
class simpleUser extends User {
public function __construct(){
//print __CLASS__." ";
parent::__construct();
}
public function show(){
print $this->name."//public ";
print $this->passwd."//private ";
print $this->email."//protected ";
}
public function inSimpleUserClassPublic() {
print __CLASS__.'::'.__FUNCTION__." ";
}
protected function inSimpleUserClassProtected(){
print __CLASS__.'::'.__FUNCTION__." ";
}
private function inSimpleUserClassPrivate() {
print __CLASS__.'::'.__FUNCTION__." ";
}
}
class adminUser extends simpleUser {
protected $admin_user;
public function __construct(){
//print __CLASS__." ";
parent::__construct();
}
public function inAdminUserClassPublic(){
print __CLASS__.'::'.__FUNCTION__." ";
}
protected function inAdminUserClassProtected(){
print __CLASS__.'::'.__FUNCTION__." ";
}
private function inAdminUserClassPrivate(){
print __CLASS__.'::'.__FUNCTION__." ";
}
}
class administrator extends adminUser {
public function __construct(){
parent::__construct();
}
}
/**
* 在类的实例中 只有公有属性和方法才可以通过实例化来调用
*/
$s = new administrator();
print '-------------------';
$s->show();
?>
注:在子类覆盖父类的方法时一定要注意,在子类中重写的方法访问权限一定不能低于父类被覆盖的方法的访问权限。例如,如果父类中的访问权限是protected,那么在子类中重写的方法的权限就要是protected或public。
本文参考地址:http://blog.163.com/weiwenjuan_bj/blog/static/14035033620129304183850/?suggestedreading 如需转载请注明出处:http://www.cnblogs.com/zhuchenglin/p/8408654.html