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<?php $prices = [7,6,4,3,1]; $buyingPrice = 0; $soldingPrice = 0; $buyedDay = 0; if (count($prices) < 2) { echo "0"; } foreach ($prices as $index => $price) { switch ($index) { case 0: $buyingPrice = $price; break; case 1: $soldingPrice = $price; break; } echo $buyingPrice; echo $buyingPrice; echo $soldingPrice; echo PHP_EOL; if ($buyingPrice > $price) { $buyingPrice = $price; $buyedDay = $index; } if (($index > $buyedDay) && (($price > $buyingPrice) && ($price > $soldingPrice))) { $soldingPrice = $price; } } if ( ($soldingPrice > $buyingPrice) && (($soldingPrice - $buyingPrice) > 0) ) { echo ($soldingPrice - $buyingPrice); } else { echo 0; }