pdo链接limit 后放变量出错，放数值能正常运行
Fatal error: Call to a member function fetch() on a non-object
$page=$_GET['page'];
$sql='select * from demo1 limit' . $page . ',10';
$res=$pdo->query($sql);
while($row=$res->fetch(pdo::FETCH_ASSOC)){
print_r($row);
echo "<br>";
}
