Summing objects property in array

Question

I have an array of objects, and i want to sum value of one of the properties, example:

Array
(
[0] => stdClass Object
    (
        [name] => jon
        [commission] => 5

    )
[1] => stdClass Object
    (
        [name] => smith
        [commission] => 1

    )
[2] => stdClass Object
    (
        [name] => philip
        [commission] => 8

    )
)  

I want to sum all the commissions in the array, result should be 14.

What is a good way for this?

Answer 1

array_reduce could be one way to do it; Just simply add your $array

$sum = array_reduce($array, function($carry, $item)
{
    return $carry + $item->commission;
});

var_dump($sum);

Answer 2

If you are using PHP 5.5

$arr_new = array_sum(array_column($yourarray, 'commission'));

Answer 3

Let's say $arr stores your information. Implement the following function:

function sumProperties(array $arr, $property) {

    $sum = 0;

    foreach($arr as $object) {
        $sum += isset($object->{$property}) ? $object->{$property} : 0;
    }

    return $sum;
}

After that you just have to call sumProperties($array, 'commission').

Furthermore if you have more properties that could be summed, you could replace commission with those properties.