How Can I Efficiently Extract Image Data (src, title, alt) from HTML Using PHP?

Efficiently Extract Image Data from HTML with PHP

Problem Statement:

To create a page listing all images from a website, along with their titles and alternative representations, a method to extract these attributes from HTML is required. The order of the attributes may vary, and obtaining all of them poses a challenge.

Extracting Data using Regular Expressions:

Initially, the problem can be approached using regular expressions. However, due to the varying order of attributes, this method is not considered elegant and may result in a laborious char-by-char parsing process.

DOMDocument Solution:

An alternative approach is to utilize the PHP DOMDocument class. This class enables the parsing of HTML and access to its elements. Here's the code to achieve this:

$url = "http://example.com";

$html = file_get_contents($url);

$doc = new DOMDocument();
@$doc->loadHTML($html);

$tags = $doc->getElementsByTagName('img');

foreach ($tags as $tag) {
    echo $tag->getAttribute('src').', ';
    echo $tag->getAttribute('title').', ';
    echo $tag->getAttribute('alt').'<br>';
}

Explanation:

This code initializes a DOMDocument object and loads the HTML into it. The getElementsByTagName method is used to retrieve all images. Each img tag is then iterated over, and the getAttribute method is employed to extract the src, title, and alt attributes. The extracted data is echoed, resulting in a formatted output of the image information.

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