How to access a class function if there is only its key?

Question

PHP

Let's say I have

$func = 'namefunction';
class A {
  public namefunction(){
   echo 1;
  }
}

a = new A;

// возможно ли как-то придумать такой способ обращения, или есть что-то на этот счет?
a->[$func](); // a->'namefunction'();

Answer 1

You all think right. Only it is necessary to use not square, but curly brackets.
In general, it is possible without brackets, but it turns out more clearly with them.
And yet, you have a amissing sign in front$