serialize-gutenberg-block.php

<?php

/**
 * Serialize an array into a Gutenberg block.
 *
 * @param array $block Block.
 * @return bool|string
 */
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 = ' ' . wp_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,
			"\n" . $block['innerHTML'] . "\n"
		);
	}
}