How to use constants with Complex (curly) syntax?

Question

I was surprised to see that the following doesn't work as expected.

define('CONST_TEST','Some string');
echo "What is the value of {CONST_TEST} going to be?";

outputs: What is the value of {CONST_TEST} going to be?

Is there a way to resolve constants within curly braces?

Yes, I am aware I could just do

echo "What is the value of ".CONST_TEST." going to be?";

but I'd prefer not to concatanate strings, not so much for performance but for readability.

Answer 1

不，这是不可能的，因为php将被认为CONST_TEST只是单引号/双引号内的一个字符串。您将必须使用串联。

echo "What is the value of ".CONST_TEST." going to be?";