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)";