How to add success message when registration is completed - php

Question

How do i make an success message when form is submitted
here is the code:
server.php
<?php
session_start();
$username = "";
$errors = array();
$db = mysqli_connect('localhost', 'root', '', 'reg_user');
// REGISTER USER
if (isset($_POST['reg_user'])) {
$username = mysqli_real_escape_string($db, $_POST['username']);
$password_1 = mysqli_real_escape_string($db, $_POST['password_1']);
if (empty($username)) { array_push($errors, "Username is required"); }
if (empty($password_1)) { array_push($errors, "Password is required"); }
$user_check_query = "SELECT * FROM users WHERE username='$username' LIMIT 1";
$result = mysqli_query($db, $user_check_query);
$user = mysqli_fetch_assoc($result);
if ($user) { // if user exists
if ($user['username'] === $username) {
array_push($errors, "Username already exists");
}
}
if (count($errors) == 0) {
$password = md5($password_1);
$query = "INSERT INTO users (username, password)
VALUES('$username', '$password')";
mysqli_query($db, $query);
$_SESSION['username'] = $username;
$_SESSION['success'] = "You are now logged in";
header('location: register.php');
}
}
index.php
<div class="card-body">
<p><?php include('errors.php'); ?></p>
<form method="POST" action="register.php" class="needs-validation" novalidate="">
<div class="form-group">
<label for="username">Username</label>
<input id="username" type="username" class="form-control" name="username" tabindex="1" required autofocus>
</div>
here is the code of error.php which it pops up a error message when username is taken
error.php
<?php if (count($errors) > 0) : ?>
<div class="alert alert-danger alert-dismissible show fade">
<div class="alert-body">
<button class="close" data-dismiss="alert">
<span>×</span>
</button>
<?php foreach ($errors as $error) : ?>
<p><center><b><?php echo $error ?></center></b></p>
<?php endforeach ?>
</div>
</div>
<?php endif ?>
I want to add success message just like the error.php but what is the code to perform an success message?

Answer 1

You can do it like:
if (!$errors)
{
header("Location: success.php");
exit;
}
or modify this part from your code:
if (count($errors) == 0) {
$password = md5($password_1);
$query = "INSERT INTO users (username, password)
VALUES('$username', '$password')";
mysqli_query($db, $query);
$_SESSION['username'] = $username;
$_SESSION['success'] = TRUE;
header('location: success.php'); exit;
}

Answer 2

Are you looking for something like this?
<?php if($_SESSION['success'] != '' ) : ?>
<label> <?php include('success.php'); ?></label>
<?php endif; ?>