Search WordPress Gutenberg blocks for a specific block name in all nested innerBlocks data

function.php

<?php

/**
 * Search blocks and innerBlocks for a specific type of block
 *
 * @param array  $blocks     Blocks to search through (use parse_blocks prior to passing).
 * @param string $block_name The type of block to search for.
 *
 * @return array Matching blocks
 */
function parse_inner_blocks( $blocks, $block_name ): array {
	$block_data = [];
	
	if ( ! is_array( $blocks ) ) {
		return $block_data ;
	}

	foreach ( $blocks as $block ) {
		if ( ! empty( $block['innerBlocks'] ) && $block_name !== $block['blockName'] ) {
			$inner_data = parse_inner_blocks( $block['innerBlocks'], $block_name );
			$block_data = array_merge( $block_data, $inner_data );
		} elseif ( $block_name === $block['blockName'] ) {
			$block_data[] = $block;
		}
	}

	return $block_data;
}