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<?php
namespace WS\Utils\Collections\Functions\Group\Aggregator;
use WS\Utils\Collections\Functions\ObjectFunctions;
class Sum
{
private $sourceKey;
public function __construct($sourceKey)
$this->sourceKey = $sourceKey;
}
public function __invoke(iterable $collection)
$sum = null;
foreach ($collection as $element) {
if (!$value = ObjectFunctions::getPropertyValue($element, $this->sourceKey)) {
continue;
$sum += $value;
return $sum;
worksolutions /
php-collections
