PHP: ジェネレーター

<?php
function myGenerator() {
  yield 1;
  yield 2;
  yield 3;
}

foreach(myGenerator() as $i) {
  echo $i . "\n";
}

<?php
function myFib() {
  $a = 0;
  $b = 1;
  for (; $c < 10000;) {
    $c = $a + $b;
    yield $c;
    $a = $b;
    $b = $c;
  }
}

foreach(myFib() as $i) {
  echo $i . "\n";
}