<?php $prices = array ( 0 => array ( 'regprice' => 25.00, 'saleprice' => 17.00 ), 1 => array ( 'regprice' => null, 'saleprice' => 19.00 ), 2 => array ( 'regprice' => 21.00, 'saleprice' => 12.00 ) ); $lowest_index = array_keys(array_column($prices, 'saleprice'), min(array_column($prices, 'saleprice'))); print_r($lowest_index);
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