Accessing the static properties of subclasses in the PHP parent class

In a class, we can access static properties/static methods in this class or parent class through self, and you can access the static properties/static methods in the parent class via parent.

But we don't have a keyword. Accessing the static property of a subclass from a method in the parent class is because the parent class was created before the subclass, so it is not a good choice to logically access the static properties of the subclass from the parent class.

But sometimes we have to do this, so we can do it through the Get_class () method:

Get_class () returns the name of this object,

Get_class (obj) returns the name of the object obj,

Look at the following example:

<?phpclass a{function GetName () {echo get_class ();   echo Get_class ($this); }}class b extends a{} $a = new A (); $b = new B (); $a->getname (); $b->getname ();

Results: Aaab

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With the subclass object name, in the use of the Eval () method, we can implement access to the subclass static property in the parent class method:

<?phpclass a{function GetName () {$class = Get_class ($this);       Eval (' $name = '. $class. ':: $name; ');   Echo $name; }}class B extends a{public static $name = ' B ';} Class C extends a{public static $name = ' C ';} $b = new B (), $c = new C (); $b->getname (); $c->getname ();

Results: BC

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If a static method is used in the parent class and cannot use $this, is there no way to do it?

Of course not!

Change Class A to the following

Can be compatible with static method calls

<?phpclass a{static function GetName () {$class = Get_called_class ();       Eval (' $name = '. $class. ':: $name; ');   Echo $name; }}class B extends a{public static $name = ' B ';} Class C extends a{public static $name = ' C ';} B::getname (); C::getname ();

Results BC

This article is from the "Dark Forest" blog, so be sure to keep this source http://mysens.blog.51cto.com/10014673/1856359

Accessing the static properties of subclasses in the PHP parent class