Question

如何在XPath查询中启动第二个和第三个XPath查询？例如

CodePad = http://codepad.viper-7.com/ZhMNGw

HTML CODE

<div class="entries">                               
    <h3 class="headline" style="position: relative; cursor: pointer;">
        <div>
            <a class="selink" href="/tste/?sd=28726585">  
                <span class="date"> 10:15 </span> 
                <span class="titel">THE TITLE<span class="subtitel">some subtitle</span>
                </span>
            </a>
        </div>                              
    </h3>
</div>  
<div class="entries">                               
    <h3 class="headline" style="position: relative; cursor: pointer;">
        <div>
            <a class="selink" href="/tste/?sd=287265995">  
                <span class="date"> 10:16 </span> 
                <span class="titel">THE TITLE 2<span class="subtitel">some subtitle</span>
                </span>
            </a>
        </div>                              
    </h3>
</div>

PHP

libxml_use_internal_errors(true);
$doc = new DOMDocument;
$doc->preserveWhiteSpace = false;
$doc->strictErrorChecking = false;
$doc->recover = true;
$doc->loadHTMLFile('http://domain.com/startpage.php');
$xpath = new DOMXPath($doc);

$query = "//div[@class='entries']"; // <- QUERY ONE

$entries = $xpath->query($query);
$list = array();

$count = 0;
foreach ($entries as $key => $value)
{        
    $list[$count] = array();

    // get the link <- QUERY TWO
    $list[$count]['url'] =  $xpath->query("//a[@class='selink']");

    // get the title but NOT the subtitle <- QUERY THREE
    $list[$count]['title'] = $xpath->query("//span[@class='titel']");


    $count++;
}


print_r($list);

Answer 1

$ xpath-＆gt;查询（$ expr）在循环内的每个调用中对整个文档执行，因为您没有通过文档节点，XPath查询应该相对评估。

使用多态方法DOMNodeList query(string $expr, DOMNode $node)，您可以执行相对于给定$节点的子查询。仅当您使用相对XPath $ expr（不带前导/）时，此方法才会生成所需结果。要从每个DOMNode / TextNode检索字符串，最后使用以下查询：

$list[$count]['url'] = $xpath->query("h3/div/a[@class='selink']/@href", $value)->item(0)->value;
$list[$count]['title'] = $xpath->query("h3/div/a/span[@class='titel']/text()", $value)->item(0)->wholeText;

我编辑了您的CodePad代码here。

的问候，最大

XPath查询中的XPath查询

1 个答案: