"Cartel","6.5" => "Ally","8" => "Public"); echo 'Quality: ' . $quality . '
'; foreach($mEnd as $k => $v) { $mDifference = $k - $mStart; $ratio = $mDifference / $qDifference; //Cost Per Extra Quality Point $value[] = round(((($quality - $qStart) * $ratio) + $mStart) * $quality); } print_r($value); }