通过变量名访问静态对象属性 [英] Access static object property through variable name

问题描述

我知道可以使用变量作为名称来访问对象属性/方法

I know its possible to access an object property/method using a variable as its name

例如:

$propName = 'something';
$something = $object->$propName;

是否可以对常量或静态属性执行相同的操作?

Is it possible to do the same w/ constants or static properties?

我试过了:

$constName = 'MY_CONST';

$constName = 'MY_CONST';

MyCLass::{$constName};

和

$obj::{$constName};

但似乎没有任何效果，我在任何地方都找不到.

But nothing seems to work and I couldn't find it anywhere.

推荐答案

使用:Class::$$constName，这个和普通的变量变量.

Use: Class::$$constName, this is similar to normal variable variables.

演示:

<?php    
class MyClass {
    public static $var = 'A';
}
$name = 'var';
echo MyClass::$$name; // echoes 'A'

可以通过 constant 功能:

Constants can be access with the constant function:

constant('MyClass::'.$constantName)

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