Supposedly Lazy Fibonacci

fib.php

<?php
foreach (fib() as $x) echo "$x\n";

function fib () {
  yield 0; yield 1;
  $f = fib(); $g = fib(); 
  $g->next();
  while (true) {
    yield $f->current() + $g->current();
    $f->next(); $g->next();
  }
}

0
1
1
2
3
5
8
13
21
34
55
89
144
233
377
610
987
1597
2584
4181
6765
10946
17711

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 20480 bytes) in /in/pkNNB on line 4

Process exited with code 255.

Oh well, it was fun while it lasted.

https://twitter.com/mathiasverraes/status/930370224930598912