復制代碼 代碼如下:

class Fibonacci implements Iterator {
    private $previous = 1;
    private $current = 0;
    private $key = 0;

    public function current() {
        return $this->current;
    }

    public function key() {
        return $this->key;
    }

    public function next() {
  // 關鍵在這里
  // 將當前值保存到  $newprevious
        $newprevious = $this->current;
  // 將上一個值與當前值的和賦給當前值
        $this->current += $this->previous;
  // 前一個當前值賦給上一個值
        $this->previous = $newprevious;
        $this->key++;
    }

    public function rewind() {
        $this->previous = 1;
        $this->current = 0;
        $this->key = 0;
    }

    public function valid() {
        return true;
    }
}

$seq = new Fibonacci;
$i = 0;
foreach ($seq as $f) {
    echo "$f ";
    if ($i++ === 15) break;
}

復制代碼 代碼如下:

0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610