Enhanced has_block() function.

readme.md

Enhanced has_block() snippet

Searching as well in reusable blocks (core's has_block() doesn't), see more in the blog post.

Author: Karolína Vyskočilová (karolina@kybernaut.cz)

Updated: 2021-04-12

OOP approach

Better performance if used multiple times withing a function (parses the content just once).

Usage:

1. Include the class (and namespace / rename it accroding to your needs).
2. Instantiate it: $helper = new BlockHelper();
3. Use $helper->has_block('block/name') in your conditions ;)

Functional approach

Usage:

1. Include both functions (and namespace / rename them accroding to your needs).
2. Call enhanced_has_block('block/name) whenever you need to check.

enhanced_has_block_functional.php

<?php
// Do not copy the line above if you don't need it.

/**
 * Has block function which searches as well in reusable blocks.
 *
 * Extends functionality of core's has_block (https://developer.wordpress.org/reference/functions/has_block/)
 *
 * @author Karolína Vyskočilová <karolina@kybernaut.cz>
 * @since 2021-04-12
 * @param mixed $block_name Full Block type to look for.
 * @return bool
 */
function enhanced_has_block($block_name)
{

	if (has_block($block_name)) {
		return true;
	}

	if (has_block('core/block')) {
		$content = get_post_field('post_content');
		$blocks = parse_blocks($content);
		return search_reusable_blocks_within_innerblocks($blocks, $block_name);
	}

	return false;
}

/**
 * Search for selected block within inner blocks.
 *
 * The helper function for enhanced_has_block() function.
 *
 * @author Karolína Vyskočilová <karolina@kybernaut.cz>
 * @since 2021-04-12
 * @param array $blocks Blocks to loop through.
 * @param string $block_name Full Block type to look for.
 * @return bool
 */
function search_reusable_blocks_within_innerblocks($blocks, $block_name)
{
	foreach ($blocks as $block) {
		if (isset($block['innerBlocks']) && !empty($block['innerBlocks'])) {
			search_reusable_blocks_within_innerblocks($block['innerBlocks'], $block_name);
		} elseif ($block['blockName'] === 'core/block' && !empty($block['attrs']['ref']) && \has_block($block_name, $block['attrs']['ref'])) {
			return true;
		}
	}
	return false;
}

enhanced_has_block_oop.php

<?php
// Do not copy the line above if you don't need it.

/**
 * Block Helper extending the functionality of core's has_blocks with search within inner blocks.
 * @package WordPress
 * @author Karolína Vyskočilová <karolina@kybernaut.cz>
 * @since 2021-04-12
 */
class BlockHelper
{

	private $blocks;

	/**
	 * Has block implementation counting with reusable blocks
	 *
	 * @param string $block_name Full Block type to look for.
	 * @return bool
	 */
	public function has_block($block_name)
	{

		if (has_block($block_name)) {
			return true;
		}

		$this->parse_reusable_blocks();

		if (empty($this->blocks)) {
			return false;
		}

		return $this->recursive_search_within_innerblocks($this->blocks, $block_name);
	}

	/**
	 * Search for a reusable block inside innerblocks
	 *
	 * @param array $blocks Blocks to loop through.
	 * @param string $block_name BFull Block type to look for.
	 * @return true|void
	 */
	private function recursive_search_within_innerblocks($blocks, $block_name)
	{
		foreach ($blocks as $block) {
			if (isset($block['innerBlocks']) && !empty($block['innerBlocks'])) {
				$this->recursive_search_within_innerblocks($block['innerBlocks'], $block_name);
			} elseif ($block['blockName'] === 'core/block' && !empty($block['attrs']['ref']) && \has_block($block_name, $block['attrs']['ref'])) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Parse blocks if at leat one reusable block is presnt.
	 *
	 * @return void
	 */
	private function parse_reusable_blocks()
	{

		if ($this->blocks !== null) {
			return;
		}

		if (has_block('core/block')) {
			$content = get_post_field('post_content');
			$this->blocks = parse_blocks($content);
			return;
		}

		$this->blocks = false;
	}
}