[WP Core - Extended has_block checker with support to reusable blocks] #gutenberg #wp #wordpress #core #has_block #block #blocks #conditionals #checker #check

wp--extended-has-block.php

<?php
/**
 * Determines whether a $post or a string contains a specific block type,
 * including blocks that are included in reusable blocks.
 *
 * @author Jb Audras – @audrasjb on socials.
 *
 * @param string                  $block_name Full Block type to look for.
 * @param int|string|WP_Post|null $post Optional. Post content, post ID, or post object. Defaults to global $post.
 * @return bool Whether the post content contains the specified block.
 *
 * @here https://jeanbaptisteaudras.com/2021/09/how-to-extend-has_block-function-to-also-check-for-gutenberg-reusable-blocks/
 */
function has_block_including_reusables( $block_name, $post = false ) {

    if ( ! has_blocks( $post ) ) {
        return false;
    }

    $post = ( ! $post ) ? get_the_ID() : $post;

    if ( $post ) {

        // This is for regular blocks
        if ( has_block( $block_name, $post ) ) {
            return true;
        }

        // This is for reusable blocks
        if ( has_block( 'block', $post ) ) {

            $content = get_post_field( 'post_content', $post );
            $blocks = parse_blocks( $content );

            if ( ! is_array( $blocks ) || empty( $blocks ) ) {
                return false;
            }

            if ( false === strpos( $block_name, '/' ) ) {
                $block_name = 'core/' . $block_name;
            }

            foreach ( $blocks as $block ) {
                if ( $block['blockName'] === 'core/block' && ! empty( $block['attrs']['ref'] ) ) {
                    if ( has_block( $block_name, $block['attrs']['ref'] ) ) {
                       return true;
                    }
                }
            }
        }
    }
    return false;
}