PHP：使用变量名称回显常量

Question

How can I do that? 我怎样才能做到这一点？

I have something like: 我有类似的东西：

define($stuff.'_FOO', 'whatever');
echo $stuff.'_FOO';

and it doesn't work :( 它不起作用:(

I just want to echo the constant's value... 我只想回应常数的价值......

Answer 1

Check out constant() . 检查constant() 。

In your case: 在你的情况下：

echo constant($stuff . '_FOO');

Answer 2

First make a constant: 先做一个常数：

define("FOO_BAR", "something more");

then you can get the value by using constant() : 那么你可以使用constant()来获取值：

echo constant("FOO_BAR");

Read more about constants in the manual . 阅读手册中有关常量的更多信息。