Registratiefout php, mysql, geen gegevens in database

Fouten

1. Je bent conflicterend mysql en mysqli .
2. name attribuut is niet gedefinieerd hier <button class="btn btn-sm m-r-5" type="submit">Register</button>
3. In register.php je vinkt isset . aan met een klas , Dit zal nooit werken if(isset($_POST['btn-signup']))
4. Evenals je Formulier name veld en ophalen velden zijn verkeerd .(form - placeholder="Full Name" name="fname" / in code - mysql_real_escape_string($_POST['fullname']) )

Verbeteringen

Wijzig dit

if(isset($_SESSION['user'])!="")

{

    header("Location: home.php");

}

naar dit

if(!empty($_SESSION['user'])){
    header("Location: home.php");
}

Bug Fixed-code

In register.php

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

    $fname = mysqli_real_escape_string($conn, $_POST['fname']);
    $uname = mysqli_real_escape_string($conn, $_POST['uname']);
    $email = mysqli_real_escape_string($conn, $_POST['email']);
    $upass = md5(mysqli_real_escape_string($conn, $_POST['pass']));

    $sql = "INSERT INTO users(fullname,username,email,password)  VALUES('$fname','$uname','$email','$upass')";
     if(mysqli_query($conn, $sql))
    {
        ?>
        <script>
            alert('successfully registered');
        </script>
        <?php
    }
    else{
        ?>
        <script>
            alert('error while registering you...');
        </script>
        <?php
    }

}

In registration.php

<button class="btn btn-sm m-r-5" type="submit" name="register">Register</button>