reg.php

<?php
	session_start();


if(isset($_POST['submit'])){
	include '../db.php';

	$username = $_POST['username'];
	$email = $_POST['email'];
	$password = $_POST['password'];
	$country = $_POST['country'];

	if(empty($username) || empty($email) || empty($password) || empty($country)){
	header("Location: ../login.php?register=empty");
	exit();

	} else{
		if(!preg_match("/^[a-zA-Z]*$/", $username)){
		header("Location: ../login.php?register=invalid");
		exit();
		}else{
			if(!filter_var($email, FILTER_VALIDATE_EMAIL)){
			header("Location: ../login.php?register=email");
			exit();
			} else {
				$sql = "SELECT * FROM users WHERE username='$username'";
				$result = mysqli_query($conn, $sql);
				$resultCheck = mysqli_num_rows($result);

				if ($resultCheck > 0) {
				header("Location: ../login.php?register=usertaken");
				exit();
				} else {
					$hashedpwd = password_hash($password, PASSWORD_DEFAULT);

					$sql = "INSERT INTO users (username, email, password, country)
 					VALUES ('$username','$email', '$hashedPwd', '$country')";
 					$result = mysqli_query($conn, $sql);
					header("Location: ../index.php?register=success");
					exit();

				}

			}
		}
	}


} else{
	header("Location: ../login.php");
	exit();
}

 ?>