<form class="login" action="<?php echo $_SERVER['PHP_SELF'] ?>" method="POST">
    <h4 class="text-center">Admin Login</h4>
    <input class="form-control" type="text" name="user" placeholder="Username" autocomplete="off"/>
    <input class="form-control" type="password" name="pass" placeholder="Password" autocomplete="new-password"/>
    <input class="btn btn-primary btn-block" type="submit"  value="Login">
  </form>

我做了表格 method="POST" 在 php ```
if ($_SERVER['REQUEST_METHOD'] == 'POST' ){

$username = $_POST['user'];
$pass = $_POST['pass'];
$hashPass = sha1($pass);

$stmt = $con->prepare("SELECT Username,Password FROM users WHERE Username = ? AND Password = ?");
$stmt->execute(array($username,$hashPass));
$count =$stmt->rowCount();

echo $count;

但是结果呢
注意：未定义的索引：第7行的c:\xampp\htdocs\ecommerc\admin\index.php中的用户
注意：未定义的索引：在第8行传入c:\xampp\htdocs\ecommerc\admin\index.php