WordPress at a glance
filter is not described

render_block filter-hook . WP 5.0.0

Filters the content of a single block.


add_filter( 'render_block', 'filter_function_name_927', 10, 2 );
function filter_function_name_927( $block_content, $block ){
	// filter...

	return $block_content;
The block content about to be appended.
The full block, including name and attributes.

Where the hook is called

wp-includes/blocks.php 230
return apply_filters( 'render_block', $block_content, $block );

Where the hook is used (in WP core)

Does not used.