UNSET & Arrays

i'm trying to unset an array element within my array -- my array looks like; $foo[0][magazine] $foo[0][subscription] $foo[0][term] $foo[0][rate] $foo[1][magazine] $foo[1][subscription] $foo[1][term] $foo[1][rate] and so forth -- when i call unset($foo[0]) for example, the entire array goes away, not just the [0] elements. how can i unset a multi-dimensional array? i have no problems using unset single-dimension arrays. thanks jason