How to Efficiently Extract Text from Specific HTML Elements Using PHP\'s DOMDocument and XPath?-PHP Tutorial-php.cn

How to Efficiently Extract Text from Specific HTML Elements Using PHP\'s DOMDocument and XPath?

Barbara Streisand

Release： 2024-11-02 08:48:29

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How to Efficiently Extract Text from Specific HTML Elements Using PHP's DOMDocument and XPath?

Parsing HTML with PHP's HTML DOMDocument

Question:

Utilizing the DOMDocument object, capture text within specific HTML elements. For example, extracting "Capture this text 1" and "Capture this text 2" from the following HTML:

<div class="main">
    <div class="text">
    Capture this text 1
    </div>
</div>

<div class="main">
    <div class="text">
    Capture this text 2
    </div>
</div>

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Answer:

Using DOMDocument::getElementsByTagName to retrieve all tags with a specific name may prove inefficient for this task. Instead, consider employing an XPath query on the document, leveraging the DOMXPath class.

Implementation:

Load HTML into a DOMDocument Object:

<code class="php">$html = <<<HTML
<div class="main">
 <div class="text">
 Capture this text 1
 </div>
</div>

<div class="main">
 <div class="text">
 Capture this text 2
 </div>
</div>
HTML;

$dom = new DOMDocument();
$dom->loadHTML($html);</code>

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Instantiate DOMXPath Object:

<code class="php">$xpath = new DOMXPath($dom);</code>

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Execute XPath Query:

<code class="php">$tags = $xpath->query('//div[@class="main"]/div[@class="text"]');</code>

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Retrieve Text Values:

<code class="php">foreach ($tags as $tag) {
 var_dump(trim($tag->nodeValue));
}</code>

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This approach effectively extracts "Capture this text 1" and "Capture this text 2" from the provided HTML.

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