Summery Summery

Returns the content of a block, including comment delimiters, serializing all attributes from the given parsed block.

Syntax Syntax

serialize_block( WP_Block_Parser_Block $block )

Description Description

This should be used when preparing a block to be saved to post content. Prefer render_block when preparing a block for display. Unlike render_block, this does not evaluate a block’s render_callback, and will instead preserve the markup as parsed.

Parameters Parameters


(WP_Block_Parser_Block) (Required) A single parsed block object.

Return Return

(string) String of rendered HTML.

Source Source

File: wp-includes/blocks.php

function serialize_block( $block ) {
	$block_content = '';

	$index = 0;
	foreach ( $block['innerContent'] as $chunk ) {
		$block_content .= is_string( $chunk ) ? $chunk : serialize_block( $block['innerBlocks'][ $index++ ] );

	if ( ! is_array( $block['attrs'] ) ) {
		$block['attrs'] = array();

	return get_comment_delimited_block_content(


Changelog Changelog

Version Description
5.3.1 Introduced.


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