<form name="form" action="" method="get">
  <input type="text" name="username" id="subject" value="Username">
  <input type="text" name="password" id="subject" value="password">
  <input type="text" name="emaill" id="subject" value="Email">
</form>
<?php

$username = $_GET['username'];
$passWord = $_GET['password'];
$email = $_GET['emaill'];
$user = 'arif';
$password = '';
$db = 'loginsys';
$host = 'localhost';
$port = 8889;


// Create connection
$conn = new mysqli($servername, $username, $password, $db);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "INSERT INTO users (username, email)
VALUES ('{$username}', '{$email}')";

if ($conn->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>

Connection failed: Access denied for user ''@'localhost' to database 'loginsys'