$hpaen=((($tphp*$fiyata)/$hpa)*10);
$hpben=((($tphp*$fiyatb)/$hpb)*10);
$hpmen=((($tphp*$fiyatm)/$hpm)*10);
$hpken=((($tphp*$fiyatk)/$hpk)*10);


$sayi = array('hpaen'=>$hpaen,'hpben'=>$hpben,'hpmen'=>$hpmen,'hpken'=>$hpken); 

$anahtar=array_keys($sayi);
$deger=array_values($sayi);

$en_buyuk_a = max($anahtar); 
$en_kucuk_a = min($anahtar);
$en_buyuk_b = max($deger); 
$en_kucuk_b = min($deger);

echo $en_buyuk_a." sayı budur : ".$en_buyuk_b." <br>"; 
echo $en_kucuk_a." sayı budur : ".$en_kucuk_b." <br>";