php xpath:查询结果中的查询 [英] php xpath: query within a query result

查看：27 发布时间：2021/10/2 19:28:46 php xpath

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问题描述

我正在尝试解析一个 html 文件.

我们的想法是使用 title 和 desc 类获取 span，并在具有属性 class='thebest' 的每个 div 中获取它们的信息.

这是我的代码:

<头><title>test</title><身体><div class="a">moshe1<div class="aa">haim</div>

<div class="a">moshe2</div><div class="b">moshe3</div><div class="thebest"><span class="title">title1</span><span class="desc">desc1</span>

<div class="thebest">span class="title">title2</span><span class="desc">desc2</span>

</html>KFIR;$doc = 新的 DOMDocument();@$doc->loadHTML($example);$xpath = new DOMXPath($doc);$expression="//div[@class='thebest']";$arts = $xpath->query($expression);foreach ($arts as $art) {$arts2=$xpath->query("//span[@class='title']",$art);echo $arts2->item(0)->nodeValue;$arts2=$xpath->query("//span[@class='desc']",$art);echo $arts2->item(0)->nodeValue;}echo "完成";

预期结果是:

title1desc1title2desc2done

我收到的结果是:

title1desc1title1desc1done

解决方案

使查询相对...以点开头(例如 ".//...").

foreach ($arts as $art) {//注意:单斜线(直接子)$titles = $xpath->query("./span[@class='title']", $art);if ($titles->length > 0) {$title = $titles->item(0)->nodeValue;回声 $title;}$descs = $xpath->query("./span[@class='desc']", $art);如果 ($descs-> 长度 > 0) {$desc = $descs->item(0)->nodeValue;回声 $desc;}}

I'm trying to parse an html file.

The idea is to fetch the span's with title and desc classes and to fetch their information in each div that has the attribute class='thebest'.

here is my code:

<?php

$example=<<<KFIR
<html>
<head>
<title>test</title>
</head>
<body>
 <div class="a">moshe1
<div class="aa">haim</div>
 </div>
 <div class="a">moshe2</div>
 <div class="b">moshe3</div>

<div class="thebest">
<span class="title">title1</span>
<span class="desc">desc1</span>
</div>
<div class="thebest">
span class="title">title2</span>
<span class="desc">desc2</span>
</div>

</body>
</html>
KFIR;


$doc = new DOMDocument();
@$doc->loadHTML($example);
$xpath = new DOMXPath($doc);
$expression="//div[@class='thebest']";
$arts = $xpath->query($expression);

foreach ($arts as $art) {
    $arts2=$xpath->query("//span[@class='title']",$art);
    echo $arts2->item(0)->nodeValue;
    $arts2=$xpath->query("//span[@class='desc']",$art);
    echo $arts2->item(0)->nodeValue;
}
echo "done";

the expected results are:

title1desc1title2desc2done

the results that I'm receiving are:

title1desc1title1desc1done

解决方案

Make the queries relative... start them with a dot (e.g. ".//…").

foreach ($arts as $art) {
    // Note: single slash (direct child)
    $titles = $xpath->query("./span[@class='title']", $art);
    if ($titles->length > 0) {
        $title = $titles->item(0)->nodeValue;
        echo $title;
    }

    $descs = $xpath->query("./span[@class='desc']", $art);
    if ($descs->length > 0) {
        $desc = $descs->item(0)->nodeValue;
        echo $desc;
    }
}

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