<?php $array = [ 0 => 0, 1 => 0.25, 2 => 0.75, 3 => 0.5, 4 => 0.5, 5 => 0.75 ]; $finalArray = []; foreach($array as $key=>$arr){ $finalArray[] = ($key > 0) ? array_sum(array_slice($array,$key)) : array_sum($array); } print_r($finalArray);
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