Detailed description of php static binding

This article briefly describes static binding in PHP. Students who are not familiar with static binding in PHP can take a look at this article about static binding in PHP!

Late static bindingThe working principle is to store the class name in the previous "non-forwarding call" (non-forwarding call).

• When making a static method call, the class name is the one explicitly specified (usually on the left side of the :: operator );

• When a non-static method call is made, it is the class to which the object belongs.

The so-called "forwarding call" (forwarding call) refers to the static call made in the following ways: self::, parent::, static:: and forward_static_call(). You can use the get_called_class() function to get the class name of the called method, and static:: points out its scope.

Limitations of self::

Use self:: or CLASS a static reference to the current class , depending on how the current method is defined Category:

Example:

class  A  {
    public static function  who () {
        echo  CLASS ;
    }
    public static function  test () {
         self :: who ();
    }
}

class  B  extends  A  {
    public static function  who () {
        echo  CLASS ;
    }
}

B :: test ();

Result:

// A

The above describes all the contents of this article. Everyone must feel confused after reading it. I hope You can read more with examples and implement two of them yourself!

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