Question

我知道我们可以使用PHP DOM来使用PHP解析HTML。我在Stack Overflow上发现了很多问题。但我有一个特定的要求。我有一个HTML内容，如下所示

<p class="Heading1-P">
    <span class="Heading1-H">Chapter 1</span>
</p>
<p class="Normal-P">
    <span class="Normal-H">This is chapter 1</span>
</p>
<p class="Heading1-P">
    <span class="Heading1-H">Chapter 2</span>
</p>
<p class="Normal-P">
    <span class="Normal-H">This is chapter 2</span>
</p>
<p class="Heading1-P">
    <span class="Heading1-H">Chapter 3</span>
</p>
<p class="Normal-P">
    <span class="Normal-H">This is chapter 3</span>
</p>

我想解析上面的HTML并将内容保存到两个不同的数组中，如：

$heading和$content

$heading = array('Chapter 1','Chapter 2','Chapter 3');
$content = array('This is chapter 1','This is chapter 2','This is chapter 3');

我可以简单地使用jQuery实现这一点。但我不确定，如果这是正确的方式。如果有人能指出我正确的方向，那就太好了。提前谢谢。

Answer 1

我使用了domdocument和domxpath来获得解决方案，你可以在以下网址找到它：

<?php
$dom = new DomDocument();
$test='<p class="Heading1-P">
    <span class="Heading1-H">Chapter 1</span>
</p>
<p class="Normal-P">
    <span class="Normal-H">This is chapter 1</span>
</p>
<p class="Heading1-P">
    <span class="Heading1-H">Chapter 2</span>
</p>
<p class="Normal-P">
    <span class="Normal-H">This is chapter 2</span>
</p>
<p class="Heading1-P">
    <span class="Heading1-H">Chapter 3</span>
</p>
<p class="Normal-P">
    <span class="Normal-H">This is chapter 3</span>
</p>';

$dom->loadHTML($test);
$xpath = new DOMXpath($dom);
    $heading=parseToArray($xpath,'Heading1-H');
    $content=parseToArray($xpath,'Normal-H');

var_dump($heading);
echo "<br/>";
var_dump($content);
echo "<br/>";

function parseToArray($xpath,$class)
{
    $xpathquery="//span[@class='".$class."']";
    $elements = $xpath->query($xpathquery);

    if (!is_null($elements)) {  
        $resultarray=array();
        foreach ($elements as $element) {
            $nodes = $element->childNodes;
            foreach ($nodes as $node) {
              $resultarray[] = $node->nodeValue;
            }
        }
        return $resultarray;
    }
}

实时结果： http://saji89.codepad.org/2TyOAibZ

Answer 2

尝试查看PHP Simple HTML DOM Parser

它具有类似于jQuery的出色语法，因此您可以轻松地按ID或类

选择任何您想要的元素

// include/require the simple html dom parser file

$html_string = '
    <p class="Heading1-P">
        <span class="Heading1-H">Chapter 1</span>
    </p>
    <p class="Normal-P">
        <span class="Normal-H">This is chapter 1</span>
    </p>
    <p class="Heading1-P">
        <span class="Heading1-H">Chapter 2</span>
    </p>
    <p class="Normal-P">
        <span class="Normal-H">This is chapter 2</span>
    </p>
    <p class="Heading1-P">
        <span class="Heading1-H">Chapter 3</span>
    </p>
    <p class="Normal-P">
        <span class="Normal-H">This is chapter 3</span>
    </p>';
$html = str_get_html($html_string);
foreach($html->find('span') as $element) {
    if ($element->class === 'Heading1-H') {
        $heading[] = $element->innertext;
    }else if($element->class === 'Normal-H') {
        $content[] = $element->innertext;
    }
}

Answer 3

这是使用 DiDOM 解析 html 的另一种方法，它在速度和内存占用方面提供了显着的 better performance。

composer require imangazaliev/didom

<?php

use DiDom\Document;

require_once('vendor/autoload.php');

$html = <<<HTML
<p class="Heading1-P">
    <span class="Heading1-H">Chapter 1</span>
</p>
<p class="Normal-P">
    <span class="Normal-H">This is chapter 1</span>
</p>
<p class="Heading1-P">
    <span class="Heading1-H">Chapter 2</span>
</p>
<p class="Normal-P">
    <span class="Normal-H">This is chapter 2</span>
</p>
<p class="Heading1-P">
    <span class="Heading1-H">Chapter 3</span>
</p>
<p class="Normal-P">
    <span class="Normal-H">This is chapter 3</span>
</p>
HTML;

$document = new Document($html);

// find chapter headings
$elements = $document->find('.Heading1-H');

$headings = [];

foreach ($elements as $element) {
    $headings[] = $element->text();
}

// find chapter texts
$elements = $document->find('.Normal-H');

$chapters = [];

foreach ($elements as $element) {
    $chapters[] = $element->text();
}

echo("Headings\n");

foreach ($headings as $heading) {
    echo("- {$heading}\n");
}

echo("Chapter texts\n");

foreach ($chapters as $chapter) {
    echo("- {$chapter}\n");
}

Answer 4

您可以选择使用DOMDocument和DOMXPath。他们确实需要一点曲线来学习，但是一旦你这样做，你会对你能达到的目标感到非常满意。

在php.net中阅读以下内容

http://php.net/manual/en/class.domdocument.php

http://php.net/manual/en/class.domxpath.php

希望这有帮助。

Answer 5

//从URL或文件

创建DOM

$html = file_get_html('http://www.google.com/');

//查找所有图片

foreach($html->find('img') as $element) 
   echo $element->src . '<br>';

//查找所有链接

foreach($html->find('a') as $element) 
   echo $element->href . '<br>';

如何在PHP中解析HTML？

5 个答案: