php มีวิธีไหนครับ หาค่า max สูงสุด ตัวแปร จากการคำณวน

<?
$n_1 = "3";
$n_2 = "2";
$n_3 = "2";
$R = "10000";
$N = $n_1+$n_2+$n_3;
$RN = $R/$N;
$province_mq1 = mysql_query("select * from hotels where province='หนองคาย'");
$province_mq2 = mysql_query("select * from hotels where province='ยโสธร'");
$province_mq3 = mysql_query("select * from hotels where province='แพร่'");
$num = "1";
while($province_mfa1 = mysql_fetch_array($province_mq1)){
		$province_mfa2 = mysql_fetch_array($province_mq2);
		$province_mfa3 = mysql_fetch_array($province_mq3);
		for($i=1;$i<=10;$i++){
			$price = $province_mfa1["price_room$i"]+$province_mfa2["price_room$i"]+$province_mfa3["price_room$i"];
			if($price <= $R){
				$C = $price;
				$CC = ($price/$N);
				$c_1 = ($province_mfa1["price_room$i"]/$n_1);
				$c_2 = ($province_mfa2["price_room$i"]/$n_2);
				$c_3 = ($province_mfa3["price_room$i"]/$n_3);
				$X = ($R-$C);
				$XX = ($X/$N);
				$X_1 = $XX+($CC-$c_1);
				$x_2 = $xx+($CC-$c_2);
				$x_3 = $XX+($CC-$c_3);
				echo "V = ".$V = $XX-( ($XX-$x_1)+($XX-$x_2)+($XX-$x_3) );
				echo "<br>";
			}
			
		}
}
?>