一个redis INFO：-ERR'info'命令的参数个数错误(A redis INFO: -ERR wrong number of arguments for 'info' command)

 为了解释， $totalDays在小部件中不可用，因为整个函数仅在呈现小部件时运行，不再声明$totalDays 。 正如@arogachev上面暗示的那样，您需要在模型中制作$totalDays ，然后才能访问它。 在你的模型中试试这个; 
 
public function getTotalDays(){
//Your logic here to generate totalDays
return $totalDays;
}
 
 然后你可以在你的视图中使用它; 
 
[
    'attribute' =>  'class_id',
    'format' => 'raw',
    'label' => "Class Date",
    'value' => function ($model) {
        array_push($model->totalDays, totalDays,$model->class->date);
        return $model->class->date;
    },
    'footer'=> '<span>Total Days</span>',
],

To explain, $totalDays is not available in the widget because the whole function only gets run when the widget is rendered, $totalDays is no longer declared. As @arogachev hinted above, you will need to make $totalDays in your model, then you can access it. Try this in your model;
 
public function getTotalDays(){
//Your logic here to generate totalDays
return $totalDays;
}
 
Then you can use it in your view like this;
 
[
    'attribute' =>  'class_id',
    'format' => 'raw',
    'label' => "Class Date",
    'value' => function ($model) {
        array_push($model->totalDays, totalDays,$model->class->date);
        return $model->class->date;
    },
    'footer'=> '<span>Total Days</span>',
],