相关疑难解决方法(0)

如何解析HTML/XML并从中提取信息？

我刚刚开始阅读有关DOM的文档和示例,以便抓取和解析文档.

例如,我有部分文件如下所示:

    <div id="showContent">
    <table>
    <tr>
        <td>
         Crap
        </td>
    </tr>
<tr>
          <td width="172" valign="top"><a href="link"><img height="91" border="0" width="172" class="" src="img"></a></td>
          <td width="10">&nbsp;</td>
          <td valign="top"><table cellspacing="0" cellpadding="0" border="0">
              <tbody><tr>
                <td height="30"><a class="px11" href="link">title</a><a><br>
                    <span class="px10"></span>
                </a></td>
              </tr>
              <tr>
                <td><img height="1" width="580" src="crap"></td>
              </tr>
              <tr>
                <td align="right">
                    <a href="link"><img height="16" border="0" width="65" src="/buy"></a>
                </td>
              </tr>
              <tr>
                <td valign="top" class="px10">
                    <p style="width: 500px;">description.</p>
                </td>
              </tr>
          </tbody></table></td>
        </tr>
    <tr>
        <td>
Crap
        </td>
    </tr>
    <tr>
        <td>
         Crap
        </td>
    </tr>
    </table>
    </div>

我正在尝试使用以下代码来获取所有tr标记并分析其中是否存在垃圾或信息:

$dom …

如何通过Domdocument PHP获得第一级dom元素？

代码不起作用的示例 - 来自问答:http://stackoverflow.com/questions/1540302/how-to-get-nodes-in-first-level-using-php-domdocument

<?php
$str=<<< EOD
<div id="header">
</div>
<div id="content">
    <div id="sidebar">
    </div>
    <div id="info">
    </div>
</div>
<div id="footer">
</div>
EOD;

$doc = new DOMDocument();
$doc->loadHTML($str);
$xpath = new DOMXpath($doc);
$entries = $xpath->query("/");
foreach ($entries as $entry) {
    var_dump($entry->firstChild->nodeValue);
}
?>

谢谢你,约瑟夫