I try to get gutenberg media gallery block output, and want to use default figcaption text feature for images titles (for js lightbox). How can i get this property figcaption text value?

add_filter( 'render_block', function( $block_content, $block ) {
    if ( 'core/gallery' !== $block['blockName'] || ! isset( $block['attrs']['ids'] ) ) {
           return $block_content;
        $li = '';

    foreach( (array) $block['attrs']['ids'] as $id ) {
        $li .= sprintf( '<li><a href="%s" data-lightbox="photo" data-title="%s"><img src="%s" class="w-100"></a></li>',
        wp_get_attachment_image_src( $id, '' )[0],
        wp_get_attachment_image_src( $id, 'thumbnail' )[0] );

    return sprintf( '<ul id="gallery-grid">%s</ul>', $li ); 
}, 10, 2 );

2 Answers 2


You’re right...the figcaptions are encoded as html in $block['innerHTML']. You could do sth. like $tmpArray = explode('</li>',$block['innerHTML']); before your foreach loop to split the HTML string into an array that matches your gallery items and inside the loop strip_tags($tmpArray[i]); to strip away all html tags and only get the text string inside <figcaption></figcaption>. You’ll only need to add a counter i to your loop to have an index for the $tmpArray.

  • Thank for idea! Seems to no direct methods to get this value by property, only html parse.
    – Mike
    Jun 18, 2019 at 16:05

Try wp_get_attachment_caption( $id ) for caption and get_post_meta( $id, '_wp_attachment_image_alt', true ) for alt-text

  • Thank for your reply! Unfortunately this return internal image properties, not from media gallery gutenberg block.
    – Mike
    Jun 17, 2019 at 19:46

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