Adding attributes to HTML tags with PHP

Published on 2023-10-01 • Modified on 2023-10-01

This snippet shows how to add attributes to HTML tags with PHP. In the following example, we use the DOMDocument library to parse some HTML, get the links and add to them a class attribute with the "pretty" value. We must use the LIBXML_HTML_NOIMPLIED LIBXML_HTML_NODEFDTD flags, or the output will contain extra body and doctype tags.

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<?php

declare(strict_types=1);

namespace App\Controller\Snippet;

/**
 * I am using a PHP trait to isolate each snippet in a file.
 * This code should be called from a Symfony controller extending AbstractController (as of Symfony 4.2)
 * or Symfony\Bundle\FrameworkBundle\Controller\Controller (Symfony <= 4.1).
 * Services are injected in the main controller constructor.
 */
trait Snippet277Trait
{
    public function snippet277(): void
    {
        $html = '<ul><li><a href="/foo">foo</a></li><li><a href="/bar">bar</a></li></ul>';
        echo $html;

        $dom = new \DOMDocument();
        $dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
        $aTags = $dom->getElementsByTagName('a');
        foreach ($aTags as $aTag) {
            $aTag->setAttribute('class', 'pretty');
        }
        echo PHP_EOL;

        echo $dom->saveHTML();

        // That's it! 😁
    }
}

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