php迭代器

<?php

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() {
        // 将当前值保存到  $newprevious
        $newprevious = $this->current;
        // 将上一个值与当前值的和赋给当前值
        $this->current += $this->previous;
        // 前一个当前值赋给上一个值
        $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 $f, ‘<br>‘;
    if ($i++ === 15) break;
} 

原理：http://www.nowamagic.net/librarys/veda/detail/2161