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<?php
declare(strict_types=1);
namespace BrenoRoosevelt;
/**
* Sums the values returned by the callabck function for each element in the collection
*
* @param iterable $items The collection
* @param callable $callback The callable that must return int or float value
* @param int $mode [optional] <p>
* Flag determining what arguments are sent to <i>callback</i>:
* </p><ul>
* <li>
* <b>CALLBACK_USE_VALUE</b> - <b>default</b> pass value as the only argument
* </li>
* <b>CALLBACK_USE_KEY</b> - pass key as the only argument
* to <i>callback</i> instead of the value</span>
* <b>CALLBACK_USE_BOTH</b> - pass both value and key as
* arguments to <i>callback</i></span>
* </ul>
* @return array
*/
function sum(iterable $items, callable $callback, int $mode = 0)
{
$sum = 0;
foreach ($items as $key => $value) {
$sum += call_user_func_array($callback, __args($mode, $key, $value));
}
return $sum;
brenoroosevelt /
php-array-functions
