如何在PHP中解析HTML？

Question

Answer 1

我已经使用

DOMDocument

和

DOMXPath

来获得解决方案：

$test = <<< 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;

$dom = new DOMDocument();
$dom->loadHTML($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(DOMXPath $xpath, string $class): array
{
    $xpathquery = "//*[@class='$class']";
    $elements = $xpath->query($xpathquery);

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

    return $resultarray;
}

Answer 2

尝试查看 PHP 简单 HTML DOM 解析器

它具有类似于 jQuery 的出色语法，因此您可以轻松地通过 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“更好的性能”。

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

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

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

// 查找所有图像

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？

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如何在PHP中解析HTML？

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