Question

如何构建正则表达式以提取<table>的内容？我想刮一个网站，但不是第一个表，只是页面中的第二个。我这样做：

preg_match('/<table[^>]+cellspacing="0"[^>]*>(.*?)<\/table>', $returnCurl, $features);

，HTML为here

我想要＆＃34;功能＆＃34;仅限表格。

Answer 1

过早接受我认为，如果你想使用DOMDocument来做，那么这里是我之前构建的通用DOM报废类，非常基础..如果你想要更多功能，还有Simple HTML DOM但是底线是不要使用正则表达式解析HTML！

<?php 
$site = 'http://www.grossiste-informatique.com/grossiste/detail_article_popup.php?code_article=POA/F200CA-KX019H';

$scraper = new DOMScraper();

//Set site and get source
$scraper->setSite($site)
        ->setSource();


echo '<table cellspacing="0" cellpadding="3" border="0" width="100%">',
        //match and return only tables inner content with cellpadding="3"
        $scraper->getInnerHTML('table', 'cellpadding=3'), 
     '</table>';

/**
 * Generic DOM scapper using DOMDocument and cURL
 */
Class DOMScraper extends DOMDocument{
    public $site;
    private $source;
    private $dom;

    function __construct(){
        libxml_use_internal_errors(true);
        $this->preserveWhiteSpace = false;
        $this->strictErrorChecking = false;
        $this->formatOutput = true;
    }

    function setSite($site){
        $this->site = $site;
        return $this;
    }

    function setSource(){
        if(empty($this->site))return 'Error: Missing $this->site, use setSite() first';
        $this->source = $this->get_data($this->site);
        return $this;
    }

    function getInnerHTML($tag, $id=null, $nodeValue = false){
        if(empty($this->site))return 'Error: Missing $this->source, use setSource() first';
        $this->loadHTML($this->source);
        $tmp = $this->getElementsByTagName($tag);
        $ret = null;
        foreach ($tmp as $v){
            if($id !== null){
                $attr = explode('=',$id);
                if($v->getAttribute($attr[0])==$attr[1]){
                    if($nodeValue == true){
                        $ret .= trim($v->nodeValue);
                    }else{
                        $ret .= $this->innerHTML($v);
                    }
                }
            }else{
                if($nodeValue == true){
                    $ret .= trim($v->nodeValue);
                }else{
                    $ret .= $this->innerHTML($v);
                }
            }
        }
        return $ret;
    }

    function innerHTML($dom){
        $ret = "";
        $nodes = $dom->childNodes;
        foreach($nodes as $v){
            $tmp = new DOMDocument();
            $tmp->appendChild($tmp->importNode($v, true));
            $ret .= trim($tmp->saveHTML());
        }
        return $ret;
    }

    function get_data($url){
        if(function_exists('curl_init')){
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
            curl_setopt($ch, CURLOPT_TIMEOUT, 5);
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            $data = curl_exec($ch);
            curl_close($ch);
            return $data;
        }else{
            return file_get_contents($url);
        }
    }
}
?>

Answer 2

I'll be the first to link you to the relevant post

改为使用DOMDocument。

另外，如果你真的想要（而且你真的不想要这个），你可以试试这个正则表达式（未经测试）：

preg_match('/<table[^>]+>.*?<table[^>]+>(.*?)<\/table>/is', $returnCurl, $features);

正则表达式从HTML页面中提取第二个表

2 个答案: