在foreach循环中获取总计字段值

Question

So my code is

if ($activities) {
      foreach ($activities as $activity) {
        $price = $activity['price'];
        if($price) {echo $price;};
      }
    }

and i would like to add the values of the $price field to get a grand total to echo

Answer 1

The real work goes on in this line, which increments the total every time the loop iterates (comes around): $total += $price;

$total = 0;
if ($activities) {
  foreach ($activities as $activity) {
    $price = $activity['price'];
    if($price) {
        echo $price; // do you still need this?
        $total += $price;
    }
  }
}
echo $total;

Answer 2

Why use a loop? I would use array_sum() .

$total = array_sum(array_filter(array_values($activities)));

array_values returns all the values. array_filter filters out anything that evaluates to false (like null or 0). array_sum adds them up.

Functional programming is your friend. :-)