bp_core_login_redirect( string $redirect_to, string $redirect_to_raw, WP_User $user )

function bp_core_login_redirect( $redirect_to, $redirect_to_raw, $user ) {

	// Only modify the redirect if we're on the main BP blog.
	if ( !bp_is_root_blog() ) {
		return $redirect_to;
	}

	// Only modify the redirect once the user is logged in.
	if ( !is_a( $user, 'WP_User' ) ) {
		return $redirect_to;
	}

	/**
	 * Filters whether or not to redirect.
	 *
	 * Allows plugins to have finer grained control of redirect upon login.
	 *
	 * @since BuddyPress 1.6.0
	 *
	 * @param bool    $value           Whether or not to redirect.
	 * @param string  $redirect_to     Sanitized URL to be redirected to.
	 * @param string  $redirect_to_raw Unsanitized URL to be redirected to.
	 * @param WP_User $user            The WP_User object corresponding to a
	 *                                 successfully logged in user.
	 */
	$maybe_redirect = apply_filters( 'bp_core_login_redirect', false, $redirect_to, $redirect_to_raw, $user );
	if ( false !== $maybe_redirect ) {
		return $maybe_redirect;
	}

	// If a 'redirect_to' parameter has been passed that contains 'wp-admin', verify that the
	// logged-in user has any business to conduct in the Dashboard before allowing the
	// redirect to go through.
	if ( !empty( $redirect_to ) && ( false === strpos( $redirect_to, 'wp-admin' ) || user_can( $user, 'edit_posts' ) ) ) {
		return $redirect_to;
	}

	if ( false === strpos( wp_get_referer(), 'wp-login.php' ) && false === strpos( wp_get_referer(), 'activate' ) && empty( $_REQUEST['nr'] ) ) {
		return wp_get_referer();
	}

	/**
	 * Filters the URL to redirect users to upon successful login.
	 *
	 * @since BuddyPress 1.9.0
	 *
	 * @param string $value URL to redirect to.
	 */
	return apply_filters( 'bp_core_login_redirect_to', bp_get_root_domain() );
}