Support » Developing with WordPress » Get full size img width/height from Post API query

  • Resolved antonemery


    I am working on a headless WordPress project, using the WordPress API and Gutenberg blocks. I added some code from here that exposes all Gutenberg Blocks to the API. That is working great.

    For each image block in a Post I would like to include the full size width and height. Is there a way to do that on the WordPress side and add the result to the main Posts query? This is to avoid having to query for Posts on the front end, and then make an additional query for using the image id for each image block in a Post.


Viewing 3 replies - 1 through 3 (of 3 total)
  • Were you looking for something like this? Pushed the width and height to “mediaDetails”

    	function () {
    		if ( ! function_exists( 'use_block_editor_for_post_type' ) ) {
    			require ABSPATH . 'wp-admin/includes/post.php';
    		// Surface all Gutenberg blocks in the WordPress REST API
    		$post_types = get_post_types_by_support( [ 'editor' ] );
    		foreach ( $post_types as $post_type ) {
    			if ( use_block_editor_for_post_type( $post_type ) ) {
    						'get_callback' => function ( array $post ) {
    							$blocks = parse_blocks( $post['content']['raw'] );
    							foreach ( $blocks as $key => $block ) {
    								if ( $block['blockName'] === 'core/image' ) {
    									$meta = wp_get_attachment_metadata( $block['attrs']['id'] );
    									$blocks[ $key ]['mediaDetails'] = array(
    										'width' => $meta['width'],
    										'height' => $meta['height'],
    							return $blocks;

    I think that might work, just based on reading over it. I ended up putting together and solution based on this blog post. It is not quite the same, as they are getting the featured image and I want every Gutenberg block that is an image, as well as any short code blocks that use a certain image component.

    function add_image_attrs() {
    	register_rest_field('post', 'image-dimensions', array(
    		'get_callback' => 'getImageProperties',
    		'update_callback' => null,
    		'schema' => null,
    add_action('rest_api_init', 'add_image_attrs');
    function getImageProperties() {
    	// current Post
    	global $post;
    	// regex to get all image ID's within Gutenberg post content, initialize $matches variable, set results to that
    	$imageIds = array();
    	if(preg_match_all('<!-- wp:image {"id":(\d+)} -->', $post->post_content, $matches)) {
    		array_push($imageIds, $matches[1]);
    	if(preg_match_all('#wp-image-(\d+)#', $post->post_content, $matches)) {
    		array_push($imageIds, $matches[1]);
    	if (empty($matches[1])) {
    	// map over $matches array, get metadata using each ID, return ID, width, height
    	$results = array_map(function($imageId) {
    		$image = wp_get_attachment_metadata($imageId);
    		return [
    	}, $matches[1]);
    	return $results;

    I hope perhaps it is useful to someone.

    Marking as resolved

Viewing 3 replies - 1 through 3 (of 3 total)
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