wp_lostpassword_url( string $redirect = '' )

function wp_lostpassword_url( $redirect = '' ) {
	$args = array( 'action' => 'lostpassword' );
	if ( !empty($redirect) ) {
		$args['redirect_to'] = urlencode( $redirect );
	}

	$lostpassword_url = add_query_arg( $args, network_site_url('wp-login.php', 'login') );

	/**
	 * Filters the Lost Password URL.
	 *
	 * @since WP-2.8.0
	 *
	 * @param string $lostpassword_url The lost password page URL.
	 * @param string $redirect         The path to redirect to on login.
	 */
	return apply_filters( 'lostpassword_url', $lostpassword_url, $redirect );
}