PHP static variables in double quotes

Question

How can I get PHP to evaluate a static variable in double quotes?

I want to do something like this:

log("self::$CLASS $METHOD entering");


        

Answer 1

//define below
function EXPR($v) { return $v; }
$E = EXPR;

//now you can use it in string
echo "hello - three is equal to $E(1+2)";

Answer 2

Unfortunately there is no way how to do this yet. Example in one of answers here will not work, because {${self::$CLASS}} will not returns content of self::$CLASS, but will returns content of variable with name in self::$CLASS.

Here is an example, which does not returns myvar, but aaa:

$myvar = 'aaa';
self::$CLASS = 'myvar';
echo "{${self::$CLASS}}";

Answer 3

Sorry, you can't do that. It only works for simple expressions. See here.