我的第二行php代碼之接受get請求串連資料庫實現登入驗證

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<?php$conn = mysql_connect("localhost","root","") or die("failed to connect db");mysql_select_db("lio", $conn) or die ("failed to select db");//mysql_query("SET NAMES 'UTF8'",$conn);$username=$_GET['user'];$passwd=$_GET['passwd'];$sql = "select * from userinfo where user='$username' and passwd='$passwd'";$Result = mysql_query($sql, $conn);$onerow = mysql_fetch_array($Result);if ($onerow )    echo "正確";else    echo "錯誤";?>

我的第二行php代碼之接受get請求串連資料庫實現登入驗證