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Home Backend Development PHP Tutorial PHP接口中方法的参数和实现类方法中的参数可以不一致的问题

PHP接口中方法的参数和实现类方法中的参数可以不一致的问题

Jun 06, 2016 pm 08:50 PM
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interface Dispatch2

{

    public function getController();

}

 

class QueryString implements Dispatch2

{

    public function getController($url = '', $url2 = '')

    {

        echo '234';

    }

}

 

$b = new QueryString();

echo $b->getController();

Copy after login
Copy after login

以上程序是可以正常运行的,据了解,JAVA里面像这种用法是不可以的,而且这种用法看起来也是挺不合理的,为什么在PHP里面可以用呢?

回复内容:

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interface Dispatch2

{

    public function getController();

}

 

class QueryString implements Dispatch2

{

    public function getController($url = '', $url2 = '')

    {

        echo '234';

    }

}

 

$b = new QueryString();

echo $b->getController();

Copy after login
Copy after login

以上程序是可以正常运行的,据了解,JAVA里面像这种用法是不可以的,而且这种用法看起来也是挺不合理的,为什么在PHP里面可以用呢?

PHP的函数调用,是通过查表,找到函数名称所对应的函数上。

PHP的函数重载和其他语言不同,它收到的不同个数的参数,实际上都是将其作为一个数组传递给函数。

因此你列举的函数调用,没有参数也能执行,因为其参数数组为空,这一情况是合理的。

PHP函数调用不检查参数个数的匹配。

参考:这里
还有这里

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