public static function isTaken($username, $email = null)
{
require_once "../classes/class.query_operator.php";
$nonUniqueFields = [];
// Check if username is already taken
if (!QueryOperator::isUnique("username", $username)) {
$nonUniqueFields["username"] = $username . " already exists";
}
// Check if email is already taken
if (!is_null($email) && !QueryOperator::isUnique("email", $email)) {
$nonUniqueFields["email"] = $email . " already exists";
}
// Inputted username or email were already taken
if (!empty($nonUniqueFields)) {
// Create a session for the taken input fields
SessionOperator::setInputErrors($nonUniqueFields);
return true;
}
// No error
return false;
}
