test123

<?php

error_reporting(-1);

$check = mysqli_query($conn,"SELECT * FROM korisnici WHERE username ='".$username."'");
$usercheck = mysqli_num_rows($check);

if($usercheck != 0)
{

    if (isset($_POST["btnreg"]))
    {

        if(strlen($username) > 25 || strlen($username) < 3)
        {
            $error[] = "Username limit 25";
        }

        if(strlen($password)>64||strlen($password)<8)
        {
            $error[] = "PASS limit 25";
        }

        if($password != $repassword)
        {
           $error[] = "pass don match";
        }

        if($email != $reemail)
        {
            $error[] = "email dont match";
        }

        if (empty($error))
        {
            $d = 'INSERT INTO korisnici (username, password, email, maincategory, subcategory) VALUES ("'.$username.'", "'.$password.'", "'.$email.'", "'.$maincategories.'", "'.$subcategories.'")';
            $query = mysqli_query($conn, $d);

            if ($query)
            {
                echo "Registration sucessfully.";
            }
            else
            {
                echo "There was a problem registering user.";
            }
        }
    }

}

// test
foreach ($error as $key)
{
    echo "ERROR: " . $key;
}

?>