php设计模式学习2.15. 迭代器模式
作用
我感觉就是统一了,其他没什么感觉。
实现Iterator就是迭代器了
<?php
class Chapter
{
public $content;
public $title;
public function __construct($title,$content)
{
$this->title = $title;
$this->content = $content;
}
}
Class ChapterList implements \Countable,\Iterator
{
protected $chapters = []; //所有章节
protected $index = 0; //当前看到的章节索引
public function addChapter(Chapter $chapter)
{
$this->chapters[] = $chapter;
}
public function count() //总章节数
{
return count( $this->chapters);
}
public function rewind() { $this->index = 0; } //重置索引
public function current(){ return $this->chapters[$this->index]; } //当前数据
public function next() { return $this->index++; } //下一章
public function valid(){ return isset($this->chapters[$this->index]); } //是否存在当前索引
public function key(){ return $this->index; } //当前所在索引
}
//运行
$chapterList = new ChapterList();
for($i =0;$i < 10;$i++)
$chapterList->addChapter(
new Chapter("第{$i}章\n","{$i}章的内容\n")
);
echo '总章节:'.$chapterList->count().PHP_EOL;
echo '当前章节标题'.$chapterList->current()->title;
$chapterList->next();
echo '下一章节标题'.$chapterList->current()->title;
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