PHP抽象属性 [英] PHP abstract properties

问题描述

有没有办法在 PHP 中定义抽象类属性?

Is there any way to define abstract class properties in PHP?

abstract class Foo_Abstract {
    abstract public $tablename;
}

class Foo extends Foo_Abstract {
    //Foo must 'implement' $property
    public $tablename = 'users';   
}

推荐答案

没有定义属性这样的东西.

There is no such thing as defining a property.

您只能声明属性，因为它们是初始化时保留在内存中的数据的容器.

You can only declare properties because they are containers of data reserved in memory on initialization.

另一方面，函数可以被声明(类型、名称、参数)而不被定义(函数体缺失)，因此可以被抽象化.

A function on the other hand can be declared (types, name, parameters) without being defined (function body missing) and thus, can be made abstract.

Abstract"仅表示已声明但未定义的东西，因此在使用它之前，您需要定义它，否则它就变得无用了.

"Abstract" only indicates that something was declared but not defined and therefore before using it, you need to define it or it becomes useless.

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