<?php
    include_once 'header.php';
?>

<section class="main-container">
    <div class="main-wrapper">
        <h2>Signup</h2>
        <form class="signup-form" action="includes/signup.inc.php" method="POST">
            <input type="text" name="first" placeholder="Firstname">
            <input type="text" name="last" placeholder="Lastname">
            <input type="text" name="email" placeholder="E-mail">
            <input type="text" name="uid" placeholder="Username">
            <input type="text" name="pwd" placeholder="Password">
            <button type="submit" name="submit">Sign up</button>
        </form>
    </div>
</section>

<?php
    include_once 'footer.php';
?>

<?php

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

    include_once 'dbh.inc.php';

    $first = mysqli_real_escape_string($conn, $_POST['first']);
    $last = mysqli_real_escape_string($conn, $_POST['last']);
    $email = mysqli_real_escape_string($conn, $_POST['email']);
    $uid = mysqli_real_escape_string($conn, $_POST['uid']);
    $pwd = mysqli_real_escape_string($conn, $_POST['pwd']);

    //Error handlers
    //Check for empty fields
    if (empty($first) || empty($last) || empty($email) || empty($uid) || empty($pwd)) {
        header("Location: ../signup.php?signup=empty");
        exit();
    } else {
        //Check if input characters are valid
        if (!preg_match("/^[a-zA-Z]*$/", $first) || !preg_match("/^[a-zA-Z]*$", $last)) {
            header("Location: ../signup.php?signup=invalid");
            exit();
        } else {
            //Check if email is valid
            if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
                header("Location: ../signup.php?signup=email");
                exit();
            } else {
                $sql = "SELECT * FROM users WHERE user_uid='$uid'";
                $result = mysqli_query($conn, $sql);
                $resultCheck = mysqli_num_rows($result);

                if ($resultCheck > 0) {
                    header("Location: ../signup.php?signup=usertaken");
                    exit();
                } else {
                    //Hashing the password
                    $hashedPwd = password_hash($pwd, PASSWORD_DEFAULT);
                    //Insert the user into the database
                    $sql = "INSERT INTO users (user_first, user_last, user_email, user_uid, user_pwd) VALUES ('$first', '$last', '$email', '$uid', '$hashedPwd');";
                    mysqli_query($conn, $sql);
                    header("Location: ../signup.php?signup=success");
                    exit();
                }
            }
        }
    }

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

<?php

$dbServername = "MYSERVERNAME";
$dbUsername = "MYUSERNAME";
$dbPassword = "MYPASSWORD";
$dbName = "MYDATABASENAME";

$conn = mysqli_connect($dbServername, $dbUsername, $dbPassword, $dbName);