With PHP 7.2 (suspect 7.4 too) and version 3.5.0
if the Data Provider has a sort which is defined as [ 'field' => 'DESC' ]
it raises an error for the sorting icon:
2022-03-23 11:11:36 [93.34.237.144][7][-][error][yii\base\ErrorException:8] yii\base\ErrorException: Undefined index: DESC in /var/www/html/vendor/kartik-v/yii2-grid/src/DataColumn.php:311
Stack trace:
Chainging it to [ 'fileld' => SORT_DESC ]
fixes the problem (which probably is the correct way of doing it anyway).
Problem is that somehow with PHP 8.x (which I use for development) this does not happen (could not figure out exactly why) and php 7.2 stared doing it with new version of yii2-grid (it worked just fine before).
So it's somehow a regression.
Your issue, is not related to the extension but is a Yii2 standard. Yes you need to change it to SORT_DESC and SORT_ASC as that is the recommended way for Yii2 Data Provider sort handling.
With PHP 7.2 (suspect 7.4 too) and version 3.5.0 if the Data Provider has a sort which is defined as [ 'field' => 'DESC' ]
it raises an error for the sorting icon: 2022-03-23 11:11:36 [93.34.237.144][7][-][error][yii\base\ErrorException:8] yii\base\ErrorException: Undefined index: DESC in /var/www/html/vendor/kartik-v/yii2-grid/src/DataColumn.php:311 Stack trace:
0 /var/www/html/vendor/kartik-v/yii2-grid/src/DataColumn.php(311): yii\base\ErrorHandler->handleError(8, 'Undefined index...', '/var/www/html/ve...', 311, Array)
Chainging it to [ 'fileld' => SORT_DESC ] fixes the problem (which probably is the correct way of doing it anyway).
Problem is that somehow with PHP 8.x (which I use for development) this does not happen (could not figure out exactly why) and php 7.2 stared doing it with new version of yii2-grid (it worked just fine before). So it's somehow a regression.