Snippet · PHP

Enable Gallery Lightbox Automatically

Shared by Darshit Rajyaguru · June 17, 2026 · @render_block

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Adds a lightbox attribute automatically to WordPress gallery blocks.

add_filter('render_block', function ( $content, $block) {
        if ( 'core/gallery' === $block['blockName']) {
            $content = str_replace('<figure', '<figure data-lightbox="true"', $content);
        }
        return $content;
    }, 10, 2
);