phparraysmultidimensional-arraysumgrouping

Add value to total element which might not exist in an array

I want to do something like this:

foreach($values as $key => $value){
    //modify the key here, so it could be the same as one before

    //group by key and accumulate values
    $data[$key]['total'] += $value - $someothervalue;
}

Is this possible in php? or do i have to check this always first?

isset($data[$key]['total'])
Solution

  • Thanks for all the answers. I went with: 

    foreach($values as $key => $value){
    //modify the key here, so it could be the same as one before

    //group by key and accumulate values
    $inc = $value - $someothervalue;

    if (!isset($data[$key]['total']){
        $data[$key]['total'] = 0;
    }

    $data[$key]['total'] = += $inc;
}