/**
* Return the total cost for all calls given.
* @param Illuminate\Database\Eloquent\Collection $collection
* @return String
*/
private static function calculateTotalCost($collection)
{
$calls = $collection->all();
$seconds = 0;
foreach ($calls as $call) {
$seconds = $seconds + $call->totaltime;
}
$minutes = $seconds / 60;
// convert billing seconds to minutes.
$totalCost = $minutes * env('AVG_COST_PER_MIN');
return number_format($totalCost, 2);
}
