PHP Gutenberg Serializer

serialize-gutenberg.php

<?php
/**
 * Serialize Gutenberg Blocks into HTML Markup
 *
 * @param array $block Array of block data to be serialized
 * @return string      Gutenberg HTML markup of serialized block
 */
function serialize_block( $block ) {
	if ( ! isset( $block['blockName'] ) ) {
		return false;
	}

	$name = $block['blockName'];

	if ( 0 === strpos( $name, 'core/' ) ) {
		$name = substr( $name, strlen( 'core/' ) );
	}

	if ( empty( $block['attrs'] ) ) {
		$opening_tag_suffix = '';
	} else {
		$opening_tag_suffix = ' ' . json_encode( $block['attrs'] );
	}

	if ( empty( $block['innerHTML'] ) ) {
		return sprintf(
			'<!-- wp:%s%s /-->',
			$name,
			$opening_tag_suffix
		);
	} else {
		return sprintf(
			'<!-- wp:%1$s%2$s -->%3$s<!-- /wp:%1$s -->',
			$name,
			$opening_tag_suffix,
			$block['innerHTML']
		);
	}
}