最近做了一個網站用到了從網址爬取天貓和淘寶的商品信息，首先看了下手機端的網頁發現用的react，不太了解沒法搞，所以就考慮從PC入口爬取數據，但是當爬取URL獲取數據時并沒有獲取價格，庫存等的信息，仔細研究了下發現是異步請求了另一個接口，但是接口要使用refer才能獲取數據，于是就通過以下方式寫了一個簡單的爬蟲，用于爬取商品預覽圖和商品的第一個分類的價格、庫存等。

二、實現

代碼如下：

function crawlUrl($url){
import('PhpQuery.Curl');
  $curl=new \Curl();
  $result = $curl->read($url);
  $content = mb_convert_encoding( $result['content'], 'UTF-8', 'UTF-8,GBK,GB2312,BIG5' );
  $myres=array();
  if(strrpos($url,'taobao.com')!=false) {
    //匹配是否下架
    if(strpos($content,'此寶貝已下架')!==false){
      return false;
    }
    preg_match("|itemId      : '(.*)'|isU", $content, $match);
    $item_id=$match[1];
    preg_match("|sellerId     : '(.*)'|isU", $content, $match);
    $sellet_id=$match[1];
    preg_match("|<title>(.*)</title>|isU",$content,$match);
    $title=$match[1];
    //價格庫存信息
    $ch = curl_init();
    curl_setopt ($ch, CURLOPT_URL, 'https://detailskip.taobao.com/service/getData/1/p1/item/detail/sib.htm?itemId='.$item_id.'&sellerId='.$sellet_id.'&modules=dynStock,qrcode,viewer,price,duty,xmpPromotion,delivery,upp,activity,fqg,zjys,amountRestriction,couponActivity,soldQuantity,originalPrice,tradeContract&callback=onSibRequestSuccess');
    $opt[CURLOPT_HEADER]=false;
    $opt[CURLOPT_CONNECTTIMEOUT]=15;
    $opt[CURLOPT_TIMEOUT]=300;
    $opt[CURLOPT_AUTOREFERER]=true;
    $opt[CURLOPT_USERAGENT]='Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11';
    curl_setopt_array($ch,$opt);
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt ($ch,CURLOPT_REFERER,$url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $out_put=curl_exec ($ch);
    curl_close ($ch);
    $res=str_replace('onSibRequestSuccess(',"",$out_put);
    $res=rtrim($res,');1');
    $result=json_decode($res,true);
    //查詢出圖片信息
    preg_match('|<ul id="J_UlThumb" class="tb-thumb tb-clearfix">(.*)</ul>|isU', $content, $match);
    preg_match_all('/<img src="http://m.argcandargv.com/skin/default/image/lazy.gif" class="lazy" original="http://m.argcandargv.com/skin/default/image/nopic.gif" \//', $match[1], $images);

    $myres['title']=str_replace('-淘寶網','',$title);

    $myres['price']=current($result['data']['originalPrice']);

    $myres['act_price']=current($result['data']['promotion']['promoData']);

    $myres['stock']=$result['data']['dynStock']['stock'];

    $myres['banners']=$images[1];
  }else{
    //匹配是否下架
    if(strpos($content,'此寶貝已下架')!==false){
      return false;
    }
    $start=strpos($url,'&id=');
    $item_id=substr($url,$start+4,12);
    if(!is_numeric($item_id)){
      $start=strpos($url,'?id=');
      $end=strpos($url,'&spm');
      $item_id=substr($url,$start+4,$end-$start-4);
    }
    preg_match("|<title>(.*)</title>|isU",$content,$match);
    $title=$match[1];
    $myurl='https://mdskip.taobao.com/core/initItemDetail.htm?cachedTimestamp=1500562177777&queryMemberRight=true&cartEnable=true&offlineShop=false&addressLevel=2&itemId='.$item_id.'&tryBeforeBuy=false&isAreaSell=false&tmallBuySupport=true&isPurchaseMallPage=false&household=false&isForbidBuyItem=false&service3C=false&isRegionLevel=false&showShopProm=false&isSecKill=false&sellerPreview=false&isUseInventoryCenter=false&isApparel=true&callback=setMdskip&timestamp=1500562172109&isg=AiUlDZFWmP/sMgVurQSILU3Ytet/Zdis&isg2=Ajk51JIhRFqKzxmiNPP6dkYxSKXT7iySkzSTeVtu9WDf4ll0o5Y9yKdyEtHu';
    //價格庫存信息
    $ch = curl_init();
    curl_setopt ($ch, CURLOPT_URL, $myurl);
    $opt[CURLOPT_HEADER]=false;
    $opt[CURLOPT_CONNECTTIMEOUT]=15;
    $opt[CURLOPT_TIMEOUT]=300;
    $opt[CURLOPT_AUTOREFERER]=true;
    $opt[CURLOPT_USERAGENT]='Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11';
    curl_setopt_array($ch,$opt);
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt ($ch,CURLOPT_REFERER,$url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $out_put=curl_exec ($ch);
    curl_close ($ch);
    $res = mb_convert_encoding( $out_put, 'UTF-8', 'UTF-8,GBK,GB2312,BIG5' );
    $res=str_replace('setMdskip',"",$res);
    $res=str_replace('(',"",$res);
    $res=str_replace(')',"",$res);
    $result=json_decode($res,true);
    $nowk="";
    $nowstore="";
    foreach($result['defaultModel']['inventoryDO']['skuQuantity'] as $k=>$val){
      $nowk=$k;
      $nowstore=$val;
      break;
    }

    $myres['title']=str_replace('-tmall.com天貓','',$title);

    $myres['price']=$result['defaultModel']['itemPriceResultDO']['priceInfo'][$nowk]['price'];

    $myres['act_price']=isset($result['defaultModel']['itemPriceResultDO']['priceInfo'][$nowk]['suggestivePromotionList'])?$result['defaultModel']['itemPriceResultDO']['priceInfo'][$nowk]['suggestivePromotionList']:$result['defaultModel']['itemPriceResultDO']['priceInfo'][$nowk];

    $myres['stock']=$result['defaultModel']['inventoryDO']['totalQuantity']?$result['defaultModel']['inventoryDO']['totalQuantity']:$nowstore['quantity'];
    //查詢出圖片信息
    preg_match('|<ul id="J_UlThumb" class="tb-thumb tm-clear">(.*)</ul>|isU',$content, $match);
    preg_match_all('/<img src="http://m.argcandargv.com/skin/default/image/lazy.gif" class="lazy" original="http://m.argcandargv.com/skin/default/image/nopic.gif" \//',$match[1],$images);
    $myres['banners']=$images[1];
  }
  return $myres;
}

上述代碼用到phpquery的庫，但是其實沒啥用，直接用Curl就行，具體爬取的數據可以穿參查看結果，方法不區分淘寶和天貓鏈接，但是前提是必須是PC端鏈接，另外正則寫的不規范，所以可以自己重寫正則來匹配數據。

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