Database Connection with Data Send into Database

<?php
    $dbhost = 'localhost';
    $dbuser = 'root';
    $dbpass = '';
    $db = 'muktar';
    $con = mysqli_connect($dbhost, $dbuser, $dbpass, $db);
    if(!$con){
    	echo "DB Connection Error";

    }
    if(!empty($_POST)){
    	$name = $_POST['name'];
    	$phone = $_POST['cell'];
    	$email = $_POST['email'];
    	$username = $_POST['username'];
    	$password = $_POST['password'];
    	$repassword = $_POST['repass'];

    	$insert = "INSERT INTO register_user(id,name,phone,email,username,password)
    	VALUES('', '$name', '$phone', '$email', '$username', '$password')";

    	if(mysqli_query($con, $insert)){
    		echo "Registration Successfully";

    	}
    	else{
    		echo "Registration Failed";
    	}
    }
?>