为什么数据库中IP字段为空？
<?
$db=mysql_connect("localhost","root","")
or die("数据库连接失败！");
mysql_select_db("counter",$db) or die("选择数据库失败！");
$query="SELECT * FROM counter ORDER by login DESC LIMIT 1";
$res=mysql_query($query);
$result=mysql_fetch_array($res);
if($result[1]==$_SERVER['REMOTE_ADDR'])
{
$data=$result[0];
}
else{

$query="INSERT INTO counter values(NULL,'$_SERVER['REMOTE_ADDR']',NOW())";
mysql_query($query) or die("数据插入失败！");
$data=++$result[0];
}
mysql_close($db);
....