public 表示全局,类内部外部子类都可以访问;
private表示私有的,只有本类内部可以使用;
protected表示受保护的,只有本类或子类或父类中可以访问;
<br>
//父类<br>
class father{<br>
public function a(){<br>
echo "function a";<br>
}<br>
private function b(){<br>
echo "function b";<br>
}<br>
protected function c(){<br>
echo "function c";<br>
}<br>
}<br>
//子类<br>
class child extends father{<br>
function d(){<br>
parent::a();//调用父类的a方法<br>
}<br>
function e(){<br>
parent::c(); //调用父类的c方法<br>
}<br>
function f(){<br>
parent::b(); //调用父类的b方法<br>
}<br>
}<br>
$father=new father();<br>
$father->a();<br>
$father->b(); //显示错误 外部无法调用私有的方法 Call to protected method father::b()<br>
$father->c(); //显示错误 外部无法调用受保护的方法Call to private method father::c()<br>
$chlid=new child();<br>
$chlid->d();<br>
$chlid->e();<br>
$chlid->f();//显示错误 无法调用父类private的方法 Call to private method father::b()<br>
?>
以上是自己对private和public还有protected 三者的个人理解。
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