<?php $resultCache[129]= [ 'total' => 1000, 'free_from' => "2000", 'addinupshippingcosts' => "0", 'articles' => [ ['shipping_costs_total' => 22], ['shipping_costs_total' => 25], ['shipping_costs_total' => 12], ] ]; $max = array_column($resultCache[129]['articles'], 'shipping_costs_total'); arsort($max); print_r($max); reset($max); $first_key = key($max); echo $first_key; ?>
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