save_mod_rewrite_rules(): bool|null

262function save_mod_rewrite_rules() {263	global $wp_rewrite;264 265	if ( is_multisite() ) {266		return;267	}268 269	// Ensure get_home_path() is declared.270	require_once ABSPATH . 'wp-admin/includes/file.php';271 272	$home_path     = get_home_path();273	$htaccess_file = $home_path . '.htaccess';274 275	/*276	 * If the file doesn't already exist check for write access to the directory277	 * and whether we have some rules. Else check for write access to the file.278	 */279	if ( ! file_exists( $htaccess_file ) && is_writable( $home_path ) && $wp_rewrite->using_mod_rewrite_permalinks()280		|| is_writable( $htaccess_file )281	) {282		if ( got_mod_rewrite() ) {283			$rules = explode( "\n", $wp_rewrite->mod_rewrite_rules() );284 285			return insert_with_markers( $htaccess_file, 'WordPress', $rules );286		}287	}288 289	return false;290}