使用 PHP 对象访问静态属性
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Access Static properties using PHP object
提问by user2314576
This is with reference to Get a static property of an instance, I am a newbie and have the following code :
这是参考获取实例的静态属性，我是新手并且有以下代码：
class Foo
{
public static $my_static = 1;
}
class Bar extends Foo
{
}
$foo = new Foo();
$boo = new Bar();
echo Foo::$my_static; // ok
echo Bar::$my_static; // ok
echo $foo::$my_static; // ok
echo $boo::$my_static; // ok
Static variables/properties are accessed only as ClassName::static_propertyas in C++, but it is not the case in PHP... but PHP books mostly mention the className::static_propertypattern, not the object::static_propertyconstruct. Need more light on this..
静态变量/属性仅作为ClassName::static_property访问，就像在 C++ 中一样，但在 PHP 中并非如此……但 PHP 书籍大多提到className::static_property模式，而不是object::static_property构造。需要更多的了解这个..
回答by Robert
Static properties may be accessed on various ways.
可以通过多种方式访问静态属性。
Class::$aStaticProp; //by class name
$classname::$aStaticProp; // As of PHP 5.3.0 by object instance
Static properties cannot be accessed through the object using the arrow operator ->.
无法使用箭头运算符通过对象访问静态属性->。
As of PHP 5.3.0, it's possible to reference the class using a variable. The variable's value can not be a keyword (e.g. self, parent and static).
从 PHP 5.3.0 开始，可以使用变量来引用类。变量的值不能是关键字（例如 self、parent 和 static）。
More you can read in manual
您可以在手册中阅读更多内容
回答by deceze
$instance::$staticPropertyis simply a convenience shorthand for Class::$staticProperty. Since you already have an instance of a classand the syntax is unambiguous, PHP saves you from writing a potentially long class name. There's no functional difference.
$instance::$staticProperty只是 的方便简写Class::$staticProperty。由于您已经有一个类的实例并且语法是明确的，PHP 使您无需编写可能很长的类名。没有功能上的区别。
回答by Alp Altunel
within the class you have to use like self::$staticPropery if the function accessing to the variable is also static.
在类中，如果访问变量的函数也是静态的，则必须像 self::$staticPropery 一样使用。
