Hola
Triby las consultas son.
Código SQL:
Ver original$contONLINE = mysqli_query($db, "SELECT usuario, online FROM SESIONES WHERE online = '1' GROUP BY usuario");
$fullONLINE = mysqli_num_rows($contONLINE);
$userDATA = mysqli_query($db, "SELECT * FROM USUARIOS");
$fulldata = mysqli_num_rows($userDATA);