[Solved] Xampp is not running my php file, any idea what might be wrong

Abdirahman Faqooshe Asks: Xampp is not running my php file, any idea what might be wrong
i’m using Xampp and when I run the php code its self it works fine, but when I connect html and php and then I click on submit button in html, the complete php code comes out.

Any idea, what I’m missing out?

THE HTML CODE

Code:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>

<body>

<form action="register.php" method="post">

<div>
    <label for="firstname">Firstname</label>
    <input type="text" name="firstname">
</div>

<div>
    <label for="lastname">lastname</label>
    <input type="text" name="lastname">
</div>

<button type="submit">submit</button>

</form>

</body>

 </html

THE PHP CODE

Code:
<?php

$firstname = $_POST['firstname'];
 $lastname = $_POST['lastname'];

 $conn = new mysqli('localhost', 'root', '', 'testt');

 if($conn->connec_error) {
 die ('connection failed : '.$conn->connect_error);
 } else{
    $stmt = $conn->prepare("insert into testtt(firstname, lastname) values(?,?)");
 $stmt->bind_param("ss", $firstname, $lastname);
 $stmt->execute();
 echo "Registration succesfully...";
 $stmt->close();
 $conn->close();
  }

  ?>

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