[PHP面向对象]⑥--Final关键字

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<?php

class BaseClass
{
    public function test()
    {
        echo "BaseClass::test called" . "<br/>";
    }

    public function test1()
    {
        echo "BaseClass::test1 called" . "<br/>";
    }
}

class ChildClass extends BaseClass
{
    public function test($tmp)
    {
        echo "ChildClass::test called" . "<br/>";
    }
}

$obj = new ChildClass();
$obj->test();

?>
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解决

class ChildClass extends BaseClass
{
    public function test($tmp=null)
    {
        echo "ChildClass::test called ".$tmp . "<br/>";
    }
}

$obj = new ChildClass();
$obj->test("tmp");
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<?php

class BaseClass
{
    public function test()
    {
        echo "BaseClass::test called" . "<br/>";
    }

    final public function test1()
    {
        echo "BaseClass::test1 called" . "<br/>";
    }
}

class ChildClass extends BaseClass
{
    public function test($tmp = null)
    {
        echo "ChildClass::test called " . $tmp . "<br/>";
    }


}

$obj = new ChildClass();
$obj->test1();

?>
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