本文介绍了self :: vs className ::在PHP的静态className方法中的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我想个人偏好可能没有什么区别,但是当阅读各种PHP代码时,我遇到了两种访问方法类的方法。

I guess there may not be any difference but personal preference, but when reading various PHP code I come across both ways to access the methods class.

什么区别:

class Myclass
{
    public static $foo;

    public static function myMethod ()
    {
        // between:
        self::$foo;
        // and
        MyClass::$foo;
    }
}


推荐答案

(注意:最初的版本说没什么区别。实际上是有区别的。

(Note: the initial version said there was no difference. Actually there is)

确实有一个小差别。 self :: 转发静态呼叫,而 className :: 不转发静态呼叫。这仅适用于PHP 5.3+中的。

There is indeed a small diference. self:: forwards static calls, while className:: doesn't. This only matters for late static bindings in PHP 5.3+.

在静态调用中,PHP 5.3+会记住最初调用的类。使用 className :: 使PHP忘记该值(即,将其重置为 className ),而 self :: 保留它。考虑:

In static calls, PHP 5.3+ remembers the initially called class. Using className:: makes PHP "forget" this value (i.e., resets it to className), while self:: preserves it. Consider:

<?php
class A {
    static function foo() {
        echo get_called_class();
    }
}
class B extends A {
    static function bar() {
        self::foo();
    }
    static function baz() {
        B::foo();
    }
}
class C extends B {}

C::bar(); //C
C::baz(); //B

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09-22 19:15