From e91b7be056cb7ad7174def67998668dd4ab450c0 Mon Sep 17 00:00:00 2001
From: Steve Piner <steve.piner@signify.co.nz>
Date: Wed, 11 May 2022 08:47:14 +1200
Subject: [PATCH] FIX Use DataColumns content when available in CSV export

Fix #9248 broke #9173 by accidentally checking for a string key in a
numerically indexed array. Change the check to search the array instead
(fixes #10308)
---
 src/Forms/GridField/GridFieldExportButton.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Forms/GridField/GridFieldExportButton.php b/src/Forms/GridField/GridFieldExportButton.php
index 8d5b3b427..de5d523b4 100644
--- a/src/Forms/GridField/GridFieldExportButton.php
+++ b/src/Forms/GridField/GridFieldExportButton.php
@@ -234,7 +234,7 @@ class GridFieldExportButton implements GridField_HTMLProvider, GridField_ActionP
                         }
 
                         $value = $columnHeader($relObj);
-                    } elseif ($gridFieldColumnsComponent && array_key_exists($columnSource, $columnsHandled)) {
+                    } elseif ($gridFieldColumnsComponent && in_array($columnSource, $columnsHandled)) {
                         $value = strip_tags(
                             $gridFieldColumnsComponent->getColumnContent($gridField, $item, $columnSource)
                         );