PHP如何采集网页指定标签里面的数据-PHP Tutorial-php.cn

PHP如何采集网页指定标签里面的数据

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Release： 2016-06-23 13:59:44

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PHP采集问题，如何采集源码中ul标签里的数据，并写入本地数据库：

对方网页某一段源码如下：

 <ul class="priceTableRows">                                                                        <li class="cq">                                    <span class="w1"><a href="http://www.xxxx.cn/exchange-priceItem-290-1-0.html" title=" 鸡骨草" target="_blank"> 鸡骨草</a></span>                                    <span class="w2"><a href="http://www.xxxx.cn/exchange-prices-290-1-29001.html?t=1" title=" 大叶全草 广西" target="_blank"> 大叶全草 广西</a></span>                                    <span class="w9">亳州</span>                                    <span class="w3">17.00</span>                                     <span class="w4">平</span>                                    <span class="w5"><em class="up">126.67%</em></span>                                    <span class="w6"><em class="up">126.67%</em></span>                                    <span class="w7"><em class="up">286.36%</em></span>                                    <span class="w8"><a  href="http://www.xxxx.cn/exchange-prices-290-1-29001.html?t=1"  title=" 鸡骨草" target="_blank"><img  src="http://img.zyctd.com/MarketCondition/icon_chart.gif" / alt="PHP如何采集网页指定标签里面的数据" ></a></span>                                </li>                                                                           <li>                                <span class="w1"><a href="http://www.xxxx.cn/exchange-priceItem-290-1-0.html" title=" 鸡骨草" target="_blank"> 鸡骨草</a></span>                                  <span class="w2"><a href="http://www.xxxx.cn/exchange-prices-290-1-29002.html?t=1" title=" 小叶全草 广西" target="_blank"> 小叶全草 广西</a></span>                                                                <span class="w9">亳州</span>                                <span class="w3"> 20.00 </span>                                <span class="w4">平</span>                               <span class="w5"><em class="up">122.22%</em></span>                                <span class="w6"><em class="up">122.22%</em></span>                                <span class="w7"><em class="up">198.51%</em></span>                                <span class="w8"><a  href="http://www.xxxx.cn/exchange-prices-290-1-29002.html?t=1" title=" 鸡骨草" target="_blank"><img  src="http://img.zyctd.com/MarketCondition/icon_chart.gif" / alt="PHP如何采集网页指定标签里面的数据" ></a></span>                            </li>                                                               <li class="cq">                                    <span class="w1"><a href="http://www.xxxx.cn/exchange-priceItem-290-1-0.html" title=" 鸡骨草" target="_blank"> 鸡骨草</a></span>                                    <span class="w2"><a href="http://www.xxxx.cn/exchange-prices-290-1-29003.html?t=1" title=" 大叶光杆 广西" target="_blank"> 大叶光杆 广西</a></span>                                    <span class="w9">亳州</span>                                    <span class="w3">20.00</span>                                     <span class="w4">平</span>                                    <span class="w5"><em class="up">42.86%</em></span>                                    <span class="w6"><em class="up">42.86%</em></span>                                    <span class="w7"><em class="up">127.27%</em></span>                                    <span class="w8"><a  href="http://www.xxxx.cn/exchange-prices-290-1-29003.html?t=1"  title=" 鸡骨草" target="_blank"><img  src="http://img.zyctd.com/MarketCondition/icon_chart.gif" / alt="PHP如何采集网页指定标签里面的数据" ></a></span>                                </li>                                      ..........</ul>

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我需要采集所有

中、、、、这前四个标签下的数值，并写入本地数据库。

请问各位大侠，如何写采集代码呢？