php实现的一个很好用HTML解析器类可用于采集数据-技术开发php技术-Ubuntu系统_Ubuntu服务器

复制代码代码如下:
<?php
$oldSetting = libxml_use_internal_errors( true );
libxml_clear_errors();
/**
*
* -+-----------------------------------
* |php5 Framework - 2011
* |Web Site: www.iblue.cc
* |E-mail: mejinke@gmail.com
* |Date: 2012-10-12
* -+-----------------------------------
*
* @desc HTML解析器
* @author jingke
*/
class XF_HtmlDom
{
    private $_xpath = null;
    private $_nodePath = '';

    public function __construct($xpath = null, $nodePath = '')
    {
        $this->_xpath = $xpath;
        $this->_nodePath = $nodePath;
    }

    public function loadHtml($url)
    {
        ini_set('user_agent', 'Mozilla/5.0 (Linux; U; Android 2.1; en-us; Nexus One Build/ERD62) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17 Nexus');
        $content = '';
        if(strpos(strtolower($url), 'http')===false)
        {
            $content = file_get_contents($url);
        }
        else
        {
            $ch = curl_init();
            $user_agent = "Baiduspider+(+http://www.baidu.com/search/spider.htm)";
            $user_agent1='Mozilla/5.0 (Windows NT 5.1; rv:6.0) Gecko/20100101 Firefox/6.0';
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_HEADER, false);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_REFERER, $url);
            curl_setopt($ch, CURLOPT_USERAGENT, $user_agent1);
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION,1);
            $content =curl_exec($ch);
            curl_close($ch);
        }

        $html = new DOMDocument();
        $html->loadHtml($content);
        $this->_xpath = new DOMXPath( $html );
        //return $this;

    }

    public function find($query, $index = null)
    {
        if($this->_nodePath == '')
            $this->_nodePath = '//';
        else
            $this->_nodePath .= '/';

        $nodes = $this->_xpath->query($this->_nodePath.$query);
        //echo $nodes->item(0)->getNodePath();exit;


        if ($index == null && !is_numeric($index))
        {
            $tmp = array();
            foreach ($nodes as $node)
            {
                $tmp[] = new XF_HtmlDom($this->_xpath, $node->getNodePath());
            }
            return $tmp;
        }
        return new XF_HtmlDom($this->_xpath,$this->_xpath->query($this->_nodePath.$query)->item($index)->getNodePath());
    }

    /**
     * 获取内容
     */
    public function text()
    {
        if ($this->_nodePath != '' && $this->_xpath != null )
            return $this->_xpath->query($this->_nodePath)->item(0)->textContent;
        else
            return false;
    }

    /**
     * 获取属性值
     */
    public function getAttribute($name)
    {
        if ($this->_nodePath != '' && $this->_xpath != null )
            return $this->_xpath->query($this->_nodePath)->item(0)->getAttribute($name);
        else
            return false;
    }

    public function __get($name)
    {
        if($name == 'innertext')
            return $this->text();
        else
            return $this->getAttribute($name);
    }
}
$xp = new xf_HtmlDom();
$xp->loadHtml('http://www.aizhan.com/siteall/www.opendir.cn/');
$rows = $xp->find("td[@id='baidu']/a", 0)->innertext;
print_r($rows);

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