return object value with space in key

The syntax is this:

$ob->{'Device Vendor'}

I'm having a hard time trying to find an explicit reference to this in the PHP manual. I'm afraid that it needs to be inferred and you can only do so if you already know the answer. At Classes and Objects-> Properties they say:

Class member variables are called "properties". [...] They are defined by using one of the keywords public, protected, or private, followed by a normal variable declaration.

The rules that applies now is Variable variables:

In order to use variable variables with arrays, you have to resolve an ambiguity problem. That is, if you write $$a[1] then the parser needs to know if you meant to use $a[1] as a variable, or if you wanted $$a as the variable and then the [1] index from that variable. The syntax for resolving this ambiguity is: ${$a[1]} for the first case and ${$a}[1] for the second.

We are basically abusing variable variables so we can use a space.

You use the following syntax

 $ob->{'Device Vendor'}