<?php $items = [ [ 'qty' => 1, 'weight' => 1, ], [ 'qty' => 2, 'weight' => 1, ], [ 'qty' => 3, 'weight' => 1, ], [ 'qty' => 1, 'weight' => 5, ], ]; $weights = array_column($items, 'weight'); $result =0; Foreach(array_unique($weights) as $weight){ $weightitems = preg_grep("/". $weight . "/", $weights); $result += array_sum(array_column(array_intersect_key($items, $weightitems), "qty")) * $weight; } Echo $result;
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