ขอถามคุณ Extension ต่อเรื่อง (random number) หน่อยครับ

    function isTu($num){
		$i=0;
		$sql="SELECT * FROM detail_data";
		$query=mysql_query($sql);
		while($r=mysql_fetch_array($query)){
			$i++;
	        $Tu[$i]=$r["Tutorial_ID"];
		}
        if(in_array($num,$Tu))
            return true;
    }
    function isPa($num){
		$i=0;
		$sql="SELECT * FROM detail_data";
		$query=mysql_query($sql);
		while($r=mysql_fetch_array($query)){
			$i++;
   			$Pa[$i]=$r["Package_ID"];
		}
        if(in_array($num,$Pa))
            return true;
    }
    function getTu(){
        $flag=true;
        $num=rand(1,6);
        $temp=$num;
        while(!isTu($num)){
            $num=rand(1,6);
            $temp=$num;
        }
        return $temp;
    }
    function getPa(){
        $flag=true;
        $num=rand(1,6);
        $temp=$num;
        while(!isPa($num)){
            $num=rand(1,6);
            $temp=$num;
        }
        return $temp;
    }