extract_serialized_parent_block()

extract_serialized_parent_block( string $serialized_block ): string

function extract_serialized_parent_block( $serialized_block ) {
	$start = strpos( $serialized_block, '-->' ) + strlen( '-->' );
	$end   = strrpos( $serialized_block, '<!--' );
	return substr( $serialized_block, 0, $start ) . substr( $serialized_block, $end );
}