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serialize_block › WordPress Function

serialize_block ( $block )
  • (array) $block { A representative array of a single parsed block object. See WP_Block_Parser_Block. @type string $blockName Name of block. @type array $attrs Attributes from block comment delimiters. @type array[] $innerBlocks List of inner blocks. An array of arrays that have the same structure as this one. @type string $innerHTML HTML from inside block comment delimiters. @type array $innerContent List of string fragments and null markers where inner blocks were found. }
    Required: Yes
  • (string) String of rendered HTML.
Defined at:

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

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.


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(