Untitled

<?php

class db{

    public $host = "localhost";
    public $user = "root";
    public $pass = "";
    public $db_name = "oop";

    public $link;

    public function __construct(){
        $this->connect();
    }

    private function connect(){
    $this->link = new mysqli($this->host,$this->user,$this->pass,$this->db_name);
    }

    public function insert($query){
        $result = $this->link->query($query);

        if($result){
            echo "<center><h2>Registration successful</h2></center>";
        }
        else{
            echo "<center><h2>Registration not successful</h2></center>";
        }
    }
}

?>
2. form.php
<!DOCTYPE html>
<html>
<head>
<title> Registration Form</title>
<style type="text/css">
        body{
            padding: 0;
            margin:0;
            background: silver;
        }

        #form{
            width:30%;
            height:400px;
            background: white;
            margin:0 auto;
            padding: 20px;
            border: 1px solid black;
        }

        input{
            width:200px;
            height: 30px;
            margin: 5px;
            display: block;
        }
        label{
            margin:5px;
            font-weight:bold;
        }


</style>
</head>
<body>
<div id = "form">
    <h2>Registration Form</h2>
    <form method="post" action ="form.php">
        <label>User Name</label>
        <input type = "text" name = "name" placeholder="Enter user name" required="required"></input>

        <label>User Email</label>
        <input type = "text" name = "email" placeholder="Enter user Email" required="required"></input>

        <label> User Password</label>
        <input type = "password" name = "pass" placeholder="Enter password" required ="required"></input>

        <input type = "submit" name = "signup" value = "Sign Up"></input>
        </form>

</div>
</body>
</html>

<?php
include "process.php";

$db = new db();

if(isset($_POST['signup'])) {

    $user = $_POST['name'];
    $email = $_POST['email'];
    $pass = $_POST['pass'];

    $query = "INSERT INTO users(user_name,user_email,user_pass) VALUES('$user','$email','$pass')";

    $db->insert($query);
 }
?>