php延迟静态绑定的深入讲解

PHP Static延迟静态绑定用法分析

本文实例讲述了PHP

Static延迟静态绑定用法.分享给大家供大家参考,具体如下：

class

A

{

public

static

function

echoClass(){

echo

__CLASS__;

}

test(){

self::echoClass();

B

extends

echoClass()

B::test();

//输出A

下面的例子解决了上面提出的问题：

test()

static::echoClass();

//输出B

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php Late static binding 是什么?

PHP延迟静态绑定 Late Static Binding

推荐阅读以下内容：

More precisely, late static bindings work by storing the class named in the last "non-forwarding call". In case of static method calls, this is the class explicitly named (usually the one on the left of the :: operator); in case of non static method calls, it is the class of the object. A "forwarding call" is a static one that is introduced by self::, parent::, static::, or, if going up in the class hierarchy, forward_static_call(). The function get_called_class() can be used to retrieve a string with the name of the called class and static:: introduces its scope.

This feature was named "late static bindings" with an internal perspective in mind. "Late binding" comes from the fact thatstatic:: will not be resolved using the class where the method is defined but it will rather be computed using runtime information. It was also called a "static binding" as it can be used for (but is not limited to) static method calls.

如何理解php中的后期静态绑定

使用的保留关键字：

定义:

static:: 不再被解析为定义当前方法所在的类,而是在实际运行时计算的.也可以称之为"静态绑定",因为它可以用于（但不限于）静态方法的调用.

self与static的区别:

self调用的就是本身代码片段这个类,而static调用的是从堆内存中提取出来,访问的是当前实例化的那个类（即static作用于当前调用的类）

示例一(在静态环境下)

phpclass A { public static function who() { echo __CLASS__;

} public static function test() { static::who(); // 后期静态绑定从这里开始

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

B::test();?输出结果是"B"

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