迭代器模式

<?php 
class CD{
    public $singer = '';
    public $title = '';
    public $songList = array();

    public function __construct($singer, $title) {
        $this->singer = $singer;
        $this->title = $title;
    }

    public function addSong($song) {
        $this->songList[]= $song;
    }
}

class CDSearchBySingerIterator implements \Iterator {
    private $_cds = array();
    private $_valid = false;

    public function __construct($singer) {
        $rs = $this->search($singer);
        $this->init($rs);
    }

    private function search($singer) {
        //不走mysql，直接构造假数据
        //select c.id,c.singer,c.title,s.song from cd c left join songs s on c.id=s.cd_id where c.singer='$singer'
        $arr = array(
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美1'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美2'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美7'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美8'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美9'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美10'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香1'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香2'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香3'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香4'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香5'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香6'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香7'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香8'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香9'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香10'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美3'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美4'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美5'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美6')
        );
        return $arr;
    }

    private function init($data) {
        foreach ($data as $v) {
           if (!isset($this->_cds[$v['id']])) {
               $this->_cds[$v['id']] = new CD($v['singer'], $v['title']);
           }
           $this->_cds[$v['id']]->addSong($v['song']);
        }
    }

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

    public function rewind() {
        return reset($this->_cds);
    }

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

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

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

$cds = new CDSearchBySingerIterator('Jay');

foreach ($cds as $v) {
    echo '专辑信息如下：<br>';
    echo '标题：' . $v->title . '<br>';
    echo '歌手：' . $v->singer . '<br>';
    foreach ($v->songList as $key => $song) {
        echo '曲目' . ($key+1) . '：' . $song . '<br>';
    }
    echo '<br>';
}

<?php

class CD{

public $singer = '';

public $title = '';

public $songList = array();

public function __construct($singer, $title) {

$this->singer = $singer;

$this->title = $title;

}

public function addSong($song) {

$this->songList[]= $song;

}

class CDSearchBySingerIterator implements \Iterator {

private $_cds = array();

private $_valid = false;

public function __construct($singer) {

$rs = $this->search($singer);

$this->init($rs);

}

private function search($singer) {

//不走mysql，直接构造假数据

//select c.id,c.singer,c.title,s.song from cd c left join songs s on c.id=s.cd_id where c.singer='$singer'

$arr = array(

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美1'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美2'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美7'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美8'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美9'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美10'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香1'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香2'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香3'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香4'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香5'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香6'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香7'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香8'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香9'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香10'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美3'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美4'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美5'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美6')

);

return $arr;

}

private function init($data) {

foreach ($data as $v) {

if (!isset($this->_cds[$v['id']])) {

$this->_cds[$v['id']] = new CD($v['singer'], $v['title']);

}

$this->_cds[$v['id']]->addSong($v['song']);

}

public function next() {

return next($this->_cds);

}

public function rewind() {

return reset($this->_cds);

}

public function valid() {

return $this->_valid;

}

public function current() {

return current($this->_cds);

}

public function key() {

return key($this->_cds);

}

$cds = new CDSearchBySingerIterator('Jay');

foreach ($cds as $v) {

echo '专辑信息如下： ';

echo '标题：' . $v->title . ' ';

echo '歌手：' . $v->singer . ' ';

foreach ($v->songList as $key => $song) {

echo '曲目' . ($key+1) . '：' . $song . ' ';

}

echo ' ';

}

唐晓锋–BLOG

This is just a personal note.

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