Warning: mysql_fetch_array():

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in

$connect=mysql_connect("localhost","root","123") or die("无法连接数据库".mysql_error());

mysql_select_db("cmstest") or die("无法选择数据库".mysql_errno());

$sql="select * from article where pid=1";
$result=mysql_query($sql,$connect) or die("无法查询sql语句".mysql_error());
$nums=mysql_num_rows($result);
echo "nums is:".$nums;
while($res=mysql_fetch_array($result)){   
echo $res[0]; 
}

原来是$result重复了.