php抓取百度贴吧图片

<?php
//运行时间
@set_time_limit(60);
//贴吧名称
$tbname = "%CD%BC%C6%AC";
//抓取类型 0-按照帖子顺序 1-按照贴图顺序
$type = 0;
//列表页url
$listurltpl = "http://tieba.baidu.com/f?kw=%s".($type?"&tp=1":"&pn=");
//图册页url
$galleryurltpl = "http://tieba.baidu.com/photo/bw/picture/guide?kw=%s&tid=%s&next=9999";
//图片url
$imageurltpl = "http://imgsrc.baidu.com/forum/pic/item/%s.jpg";
//本地的目录
$savepath = "h:/images/";
//帖子子文件夹
$filedirtpl = $savepath."%s/";
//图片文件
$filenametpl = $savepath."%s/%s.jpg";

$listurl = sprintf($listurltpl,$tbname);
//抓取起始点
$pn = 0;
while(1)
{
    if (!$type) $listurl .= $pn;
    //得到列表页源代码
    $listhtml = file_get_contents($listurl);
    //匹配出帖子id
    if($type)
        preg_match_all('/<div class=\\"aep_wrapper\\" id=\\"pic_item_(\\d+)\\" tid=\\"\\d+\\">/',$listhtml,$m1);
    else
        preg_match_all('/<ul class=\\"threadlist_media j_threadlist_media\\" id=\\"fm(\\d+)\\"/',$listhtml,$m1);
    //得到帖子id列表
    $tidlist = $m1[1];
    echo "Fetching ... <br /> \\r\\n";
    foreach($tidlist as $tid)
    {
        echo "--Gallery $tid <br /> \\r\\n";
        $galleryurl = sprintf($galleryurltpl,$tbname,$tid);
        //得到帖子图册的源代码
        $galleryhtml = file_get_contents($galleryurl);
        //匹配出图片id
        preg_match_all('/\\{\\"original\\":\\{\\"id\\":\\"(\\w+)\\"/',$galleryhtml,$m2);
        //得到图片id列表
        $pidlist = $m2[1];
        foreach($pidlist as $pid)
        {
            echo "----Picture {$tid}/{$pid}.jpg ";
            $filedir = sprintf($filedirtpl,$tid);
            $filename = sprintf($filenametpl,$tid,$pid);
            //文件是否存在
            if(!is_file($filename))
            {
                $imageurl = sprintf($imageurltpl,$pid);
                //下载图片
                $imagebin = file_get_contents($imageurl);
                //目录是否存在
                if(!is_dir($filedir))
                    mkdir($filedir);
                //保存图片
                file_put_contents($filename,$imagebin);
                $rnd = rand(2000,5000);
                echo "Downloaded! ";
                //延时休息
                sleep(1.0*$rnd/1000);
                echo "Sleep $rnd us <br />\\r\\n";
            }
            else
                echo "Existed! <br />\\r\\n";
        }
    }
    //翻到下一页
    if (!$type) $pn += 50;
}
//该片段来自于http://outofmemory.cn