删除错误抑制操作符

I have a code like this :

foreach ($this->dayCounts as $activity => $day) {
    foreach ($day as $date => $columns) {
        foreach ($columns as $column => $value) {
            @$this->totalCounts[$activity][$column] += $value;
        }
    }
}

Basically it is adding daily values for each activity and each column to get total counts. I am using '@' operator here not to throw the warning. Is there any modification that I can make which will remove the '@' operator as it is not a good practice to use it.

The error I am getting is Undefined index with the column and activity name.

Warnings you're supressing might be caused by non-existent indexes in $this->totalCounts array. You can avoid them by explicitely initializing fields of this array.

Replace

@$this->totalCounts[$activity][$column] += $value;

with

if (!isset($this->totalCounts[$activity][$column])) {
  $this->totalCounts[$activity][$column] = 0;
}
$this->totalCounts[$activity] += $value;