PHP: why GOTO instead of recursion?(github.com)

    >>> import dis
    >>> def foo():
    ...     while True:
    ...             print "ok"
    ... 
    >>> dis.dis(foo)
      2           0 SETUP_LOOP              15 (to 18)
            >>    3 LOAD_GLOBAL              0 (True)
                  6 POP_JUMP_IF_FALSE       17

      3           9 LOAD_CONST               1 ('ok')
                 12 PRINT_ITEM          
                 13 PRINT_NEWLINE       
                 14 JUMP_ABSOLUTE            3
            >>   17 POP_BLOCK           
            >>   18 LOAD_CONST               0 (None)
                 21 RETURN_VALUE        

  fib(1) -> 1;
  fib(2) -> 1;

  fib(N) when N > 2 -> fib(fib(1), fib(2), N - 2).
  fib(_A, B, 0) -> B;
  fib(A, B, N) when N > 0 -> fib(B, A + B, N - 1).

  int fib(int count) {
     int a = 1, b =1;
     while (--count >= 2) {
        int next = a + b;
        a = b;
        b = next;
     }
     return b;
  }