array multiple

[xias]

hola

tengo un problema:

quiero crear un array tal que asi
Array ( [0] => perfumeria [0] => colonia )
Array ( [0] => perfumeria [1] => gel )
Array ( [0] => perfumeria [2] => champu )
Array ( [1] => papeleria [0] => goma )
Array ( [1] => papeleria [1] => lapiz )
Array ( [1] => papeleria [2] => folios )

probe a hacerlo con
$combinado = array($cat_prod[$j], $name_prod[$i]);-->el array se rellena dinamicamente

pero no me funciona,

me devuelve esto;
Array ( [0] => perfumeria [1] => colonia )
Array ( [0] => perfumeria [1] => gel )
Array ( [0] => perfumeria [1] => champu )
Array ( [0] => papeleria [1] => goma )
Array ( [0] => papeleria [1] => lapiz )

¿como lo puedo hacer?,

Gracias, un saludo