将数据插入数据库，但记录未插入数据库

Question

<?php
          $conn = mysqli_connect('localhost','root','','demodata') OR die("Error: " . mysqli_error($conn));
          if ($conn->connect_error) {
            die("Connection failed: " . $conn->connect_error);
          }
          echo "Connected successfully";
          $id=0;
          if(isset($_POST['save'])){
              if(!empty($_POST['empName']) && !empty($_post['empState']))
              {
                  $name= $_POST['empName'];
                  $state=$_post['empState'];
                  $query = "Insert into employee(empId,empName,empState)values(?,?,?)";
                  $stmt = $conn->prepare($query);
                  if($stmt->execute())
                  {
                         #alert massg;
                  }
                  $stmt->close();
                  $conn->close();
              }
              header("location:index.php");
          }
       ?>