使用 CURL+正则匹配获取网页信息

思路：
首先用CURL一套操作获取网页所有内容，之后用正则去匹配对应页面上的html标签。
以下是简单的实现，没写类。上传这篇文章仅供学习记录。

//调用例子
date_default_timezone_set('PRC');
error_reporting(E_ALL^E_NOTICE);
$url = 'http://bang.dangdang.com/books/newhotsales/01.00.00.00.00.00-recent7-0-0-1-1';
//这个 $arr 就是需要取的数据集合了。
$arr = GetArr($url);

//正则
function GetUl($class){return "/
(.*?)<\/ul>/is";}
function GetDiv($class){return "/
.*?<\/div>/ism";}
function GetA(){return '/(.*?)<\/a>/i';}
function GetImgSrc(){return '//i';}
function GetImgTitle(){return '//i';}
function GetImgAttr($attr = ''){return '/<\s*img\s+[^>]*?'.$attr.'\s*=\s*(\'|\")(.*?)\\1[^>]*?\/?\s*>/i';}
function GetSpan($class=''){
    if($class == '')
        return '/(.*?)<\/span>/i';
    else
        return "/(.*?)<\/span>/i";
}

//详情
function GetDetail_Info($detail_info,$k){
    $arr = explode('：',$detail_info[$k]);
    return strip_tags($arr[1]);
}
function GetTrimText($text){
    $text = substr($text,strpos($text,'
')+5);
    $text = trim($text,'“');
    $text = trim($text,'”');
    $text = trim($text,'(');
    $text = trim($text,')');
    $text = trim($text,'（');
    return trim($text,'）');
}

//curl
function Re($url = ''){
    $ch = curl_init();//初始化
    curl_setopt ($ch, CURLOPT_URL, $url);// 设置要抓取的页面地址
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);// 抓取结果直接返回（如果为0，则直接输出内容到页面）
    curl_setopt($ch, CURLOPT_HEADER, 0);                      // 不需要页面的HTTP头
    curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT,10);
    $re = curl_exec($ch);//执行
    curl_close($ch);//释放资源
    return mb_convert_encoding($re, 'utf-8', 'GBK,UTF-8,ASCII');//设置语言
}


//列表页获取信息
function GetList($url=''){
    //正则
    $a = GetA();
    preg_match_all(GetUl('bang_list clearfix bang_list_mode'),Re($url),$r,PREG_SET_ORDER );
    $arr = explode('
',$r[0][1]);unset($arr[0]);//去空
// $k从1开始
    foreach ($arr as $k=>$v){

        $array = $arr[$k];

        preg_match(GetDiv('pic'),$array,$img_div);//图片 img [1]
        preg_match($a,$img_div[0],$img_div);//详情链接 src [1]
        $detail = $img_div[1];

        preg_match(GetImgSrc(),$img_div[0],$img);//图片 img [1]
        $img = $img[1];

        preg_match(GetImgTitle(),$img_div[0],$title);//书名 title [1]
        $title = $title[1];

        preg_match_all(GetDiv('publisher_info'),$array,$author_div);//作者 div
        preg_match($a,$author_div[0][0],$author);//作者名 [2]
        $author = $author[2];

        preg_match($a,$author_div[0][1],$publish);//出版社 [2]
        $publish = $publish[2];

        preg_match(GetSpan(),$author_div[0][1],$publish_time);//出版社时间 [1]
        $publish_time = date('Y年m月d日',strtotime($publish_time[1]));

        preg_match_all(GetDiv('price'),$array,$price_div);//价格 div
        preg_match(GetSpan('price_n'),$price_div[0][0],$price_n);//现价 [1]
        $new_price = htmlspecialchars_decode($price_n[1]);

        preg_match(GetSpan('price_r'),$price_div[0][0],$price_r);//原价 [1]
        $old_price = htmlspecialchars_decode($price_r[1]);

        preg_match(GetSpan('price_s'),$price_div[0][0],$price_s);//折扣 [1]
        $price_avg = $price_s[1];

        //信息存储
        $abc[] = array(
            //书名
            'title'=>$title,
            //详情链接
            'detail'=>$detail,
            //作者
            'author'=>$author,
            //出版社
            'publish'=>$publish,
            //出版时间
            'publish_time'=>$publish_time,
            //原价
            'old_price'=>$old_price,
            //现价
            'new_price'=>$new_price,
            //折扣
            'price_avg'=>$price_avg,
            //图片
            'img'=>$img,
        );
    }

    return $abc;
}



//获取最终采集结果
function GetArr($url=''){
    $arr = GetList($url);
    foreach ($arr as $k=>$v){
        $detail_html = Re($arr[$k]['detail']);
        //书籍详情
        $img_detail = GetDiv('pic');
        preg_match_all($img_detail,$detail_html,$img);
        preg_match(GetImgAttr('alt'),$img[0][0],$detail_text);
        //详情板块
        $detail_class_t_box_left = GetUl('key clearfix');
        preg_match($detail_class_t_box_left,$detail_html,$detail);
        $detail_info = explode('
',$detail[1]);unset($detail_info[0]);
//信息存储
        $arr[$k]['ban'] = GetDetail_Info($detail_info,1);//版次
        $arr[$k]['page'] = GetDetail_Info($detail_info,2);//页数
        $arr[$k]['byte'] = GetDetail_Info($detail_info,3);//字数
        $arr[$k]['kai'] = GetDetail_Info($detail_info,5);//开本
        $arr[$k]['zhi'] = GetDetail_Info($detail_info,6);//纸张
        $arr[$k]['bao'] = GetDetail_Info($detail_info,7);//包装规格
        $arr[$k]['is_tao'] = GetDetail_Info($detail_info,8);//是否套装
        $arr[$k]['ISBN'] = trim(GetDetail_Info($detail_info,9),'所属分类');//ISBN
        //书籍详情
        $arr[$k]['detail'] = GetTrimText($detail_text[2]);
        //NULL
        $arr[$k]['ban'] == '' ? $arr[$k]['ban'] = 1:$arr[$k]['ban']=$arr[$k]['ban'];
        $arr[$k]['page'] == '' ? $arr[$k]['page'] = '暂无数据':$arr[$k]['page']=$arr[$k]['page'];
        $arr[$k]['byte'] == '' ? $arr[$k]['byte'] = '暂无数据':$arr[$k]['byte']=$arr[$k]['byte'];
    }
    return $arr;
}