สอบถามตั้งค่า UNSIGNED ZEROFILL ใน mysql หน่อยครับ

                $lodMembers="Select Member_id from tbl_member where Member_id LIKE '%M%' ORDER BY Member_id DESC"; 
		$reult=mysql_query($lodMembers) or die(mysql_error());
		$row=mysql_fetch_array($reult);
		$lodMembers1=$row['Member_id'];
		if (count($row)>0) {
		$temp=(($lodMembers1));
		$temp=intval(substr($temp, 1, strlen($temp)))+1;
		$txtMemberid="M".str_repeat("0", 5-intval(strlen($temp))).intval($temp);
	}else{
		$txtMemberid="M00001";
		}