<?php $rates = array( 'apple' => array( 'red' => 1.19, 'green' => 0.99, 'yellow' => 0.89 ) ); $cart = array( 'apple' => array( '0' => 'red', '1' => 'green' ) ); $total = 0; foreach ($cart as $key => $arr) { if (isset($rates[$key])) { foreach ($arr as $value) { $total += $rates[$key][$value] ?? 0; } } } echo $total;
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