<?php
$numbers = $objectWrappers->wrap($arrays->arrayOf($plugins->loadClass("java.lang.Long"), 1, 2, 3, 4, 5));
// 计算累积索引加权和, 累积索引加权和: [0, 1, 5, 14, 30, 55]
$numbers->runningFoldIndexed(0, function ($index, $acc, $element) {
    return $acc + $element * ($index + 1);
})->forEach(function ($it) use ($console) {
    $console->log($it);
});