block_core_heading_render

WordPress Version: 6.2

/**
 * Appending the wp-block-heading to before rendering the stored `core/heading` block contents.
 *
 * @package WordPress
 */
/**
 * Adds a wp-block-heading class to the heading block content.
 *
 * For example, the following block content:
 *  <h2 class="align-left">Hello World</h2>
 *
 * Would be transformed to:
 *  <h2 class="align-left wp-block-heading">Hello World</h2>
 *
 * @param array  $attributes Attributes of the block being rendered.
 * @param string $content Content of the block being rendered.
 *
 * @return string The content of the block being rendered.
 */
function block_core_heading_render($attributes, $content)
{
    if (!$content) {
        return $content;
    }
    $p = new WP_HTML_Tag_Processor($content);
    $header_tags = array('H1', 'H2', 'H3', 'H4', 'H5', 'H6');
    while ($p->next_tag()) {
        if (in_array($p->get_tag(), $header_tags, true)) {
            $p->add_class('wp-block-heading');
            break;
        }
    }
    return $p->get_updated_html();
}