How Can I Efficiently Extract Image Source URLs from HTML Using PHP?

Extracting Image Details from HTML with PHP

Background

To present a comprehensive view of images on a website, you may want to extract their source URLs, titles, and alternative representations from HTML source code. While this task may seem straightforward, the varying order of tags presents a parsing challenge.

Efficient Parsing

Rather than relying on painful character-by-character processing, PHP provides an elegant solution through the use of DOMDocument. This class allows for the manipulation of HTML as an XML document, making extraction more manageable.

Implementation

$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');
}

Explanation

• file_get_contents() retrieves the HTML code from the specified URL.
• DOMDocument creates an XML representation of the HTML, making it available for traversal.
• getElementsByTagName('img') retrieves all elements from the HTML.
• For each image tag, the code retrieves and prints its 'src' attribute, which specifies the image source URL.

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