self :: vs className :: inside static className metods in PHP [英] self:: vs className:: inside static className metods in PHP

问题描述

我想这可能没有任何区别，但个人喜好，但是当阅读各种PHP代码时，我遇到了两种方法访问方法类。

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.

什么是区别：

class Myclass
{
    public static $foo;

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

推荐答案

注意：初始版本说没有区别，实际上有）

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

确实有一点小差别。 self :: 转发静态调用，而 className :: 则不会。这只适用于PHP 5.3中的延迟静态绑定。

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忘记此值（即将其重置为 className ），而 self :: 保存它。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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