From 46461be818d5de9cc6902df9505e4a0b1c6ced2a Mon Sep 17 00:00:00 2001
From: Hannes Heute <5753419+haheute@users.noreply.github.com>
Date: Wed, 4 Jan 2023 14:25:33 +0100
Subject: [PATCH] improve previous / next function in photo gallery

---
 mod/photos.php | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/mod/photos.php b/mod/photos.php
index a1aebfac66..2f9c5ca310 100644
--- a/mod/photos.php
+++ b/mod/photos.php
@@ -937,11 +937,17 @@ function photos_content(App $a)
 				$nxt = null;
 				foreach ($prvnxt as $z => $entry) {
 					if ($entry['resource-id'] == $ph[0]['resource-id']) {
-						$prv = $z - 1;
-						$nxt = $z + 1;
+						$prv = ($order_field === 'created') ? ($z - 1) : ($z + 1);
+						$nxt = ($order_field === 'created') ? ($z + 1) : ($z - 1);
 						if ($prv < 0) {
 							$prv = count($prvnxt) - 1;
 						}
+						if ($nxt < 0) {
+							$nxt = count($prvnxt) - 1;
+						}
+						if ($prv >= count($prvnxt)) {
+							$prv = 0;
+						}
 						if ($nxt >= count($prvnxt)) {
 							$nxt = 0;
 						}