一、思路

最近做了一个网站用到了从网址爬取天猫和淘宝的商品信息，首先看了下手机端的网页发现用的react，不太了解没法搞，所以就考虑从PC入口爬取数据，但是当爬取URL获取数据时并没有获取价格，库存等的信息，仔细研究了下发现是异步请求了另一个接口，但是接口要使用refer才能获取数据，于是就通过以下方式写了一个简单的爬虫，用于爬取商品预览图和商品的第一个分类的价格、库存等。

二、实现

代码如下：

php;" >
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,'此宝贝已下架')!==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];
  //价格库存信息
  $ch = curl_init();
  curl_setopt ($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);
  //查询出图片信息
  preg_match('|<ul id="J_UlThumb" class="tb-thumb tb-clearfix">(.*)</ul>|isU', $content, $match);
  preg_match_all('/<img data-src="(.*?)" \//', $match[1], $images);

  $myres['title']=str_replace('-淘宝网','',$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,'此宝贝已下架')!==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×tamp=1500562172109&isg=AiUlDZFWmP/sMgVurQSILU3Ytet/Zdis&isg2=Ajk51JIhRFqKzxmiNPP6dkYxSKXT7iySkzSTeVtu9WDf4ll0o5Y9yKdyEtHu';
  //价格库存信息
  $ch = curl_init();
  curl_setopt ($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;
  }

  $myres['title']=str_replace('-tmall.com天猫','',$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'];
  //查询出图片信息
  preg_match('|<ul id="J_UlThumb" class="tb-thumb tm-clear">(.*)</ul>|isU',$content, $match);
  preg_match_all('/<img src="(.*?)" \//',$match[1],$images);
  $myres['banners']=$images[1];
 }
 return $myres;
}

上述代码用到phpquery的库，但是其实没啥用，直接用Curl就行，具体爬取的数据可以穿参查看结果，方法不区分淘宝和天猫链接，但是前提是必须是PC端链接，另外正则写的不规范，所以可以自己重写正则来匹配数据。

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