from regestarion database in php

php
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "registration";

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

if(isset($_POST['submit']))
{
    $name = $_POST['name'];
    $username = $_POST['username'];
    $password = $_POST['password'];
    $email = $_POST['email'];

    $sql = "INSERT INTO users (name, username, password, email) VALUES ('$name', '$username', '$password', '$email')";

    if (mysqli_query($conn, $sql)) {
        echo "New record created successfully";
    } else {
        echo "Error: " . $sql . "<br>" . mysqli_error($conn);
    }