Php запрос в html файле

<?php
$servername = "localhost";
$database = "base";
$username = "root";
$password = "";
 
$conn = mysqli_connect($servername, $username, $password, $database);
 
if (!$conn) {
      die("Connection failed: " . mysqli_connect_error());
}
 
echo "Connected successfully";
 
$sql = "INSERT INTO test (num) VALUES ('Th')";
if (mysqli_query($conn, $sql)) {
      echo "New record created successfully";
} else {
      echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
mysqli_close($conn);
?>

print_r($_POST);

$c = $_POST['имя'];

<?php
$servername = "localhost";
$database = "my_in";
$username = "root";
$password = "";
 
$conn = mysqli_connect($servername, $username, $password, $database);
if (!$conn) {
      die("Connection failed: " . mysqli_connect_error());
}
 
echo "Connected successfully";
 
$sql = "INSERT INTO test (num) VALUES ('1105')";
if (mysqli_query($conn, $sql)) {
      echo "New record created successfully";
} else {
      echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
mysqli_close($conn);
?>

error_reporting(-1);
ini_set('display_errors', 1);
// скорее всего в php.ini не раскомментировано extension=php_mysqli.dll
// или/и смотрите phpinfo
echo (!extension_loaded('mysqli'))
? '
    Расширение mysqli не подключено'
:'
    mysqli ready';