获取PHP中动态选择的类常量的值 [英] Get value of dynamically chosen class constant in PHP

问题描述

我希望能够做这样的事情:

class ThingIDs
{
    const Something = 1;
    const AnotherThing = 2;
}

$thing = 'Something';
$id = ThingIDs::$thing;

这不起作用.有一种简单的方法可以做一些等效的事情吗?请注意，我被班级困住了.它在我无法重写的库中.我正在编写在命令行上接受参数的代码，并且真的希望它接受符号名而不是ID号.

解决方案

$id = constant("ThingIDs::$thing");

http://php.net/manual/en/function.constant.php

I would like to be able to do something like this:

class ThingIDs
{
    const Something = 1;
    const AnotherThing = 2;
}

$thing = 'Something';
$id = ThingIDs::$thing;

This doesn't work. Is there a straightforward way of doing something equivalent? Note that I'm stuck with the class; it's in a library I can't rewrite. I'm writing code that takes arguments on the command line, and I would really like it to take symbolic names instead of id numbers.

解决方案

$id = constant("ThingIDs::$thing");

http://php.net/manual/en/function.constant.php

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