public function loadUserByEmail( string $email ) : ?User {
$filename = $this->baseFolder . "users/" . $email . ".user";
if ( file_exists( $filename ) ) {
$data = explode( "\r\n", file_get_contents( $filename ) );
$user = new User( $data[ 1 ], $email, $data[ 0 ] );
return $user;
} else {
return null;
}
}