WordPress at a glance
function is not described

register_block_core_search() WP 1.0

Registers the core/search block on the server.

No Hooks.

Return

Null. Nothing.

Usage

register_block_core_search();

Code of register_block_core_search() WP 5.5.3

<?php
function register_block_core_search() {
	register_block_type_from_metadata(
		__DIR__ . '/search',
		array(
			'render_callback' => 'render_block_core_search',
		)
	);
}