How do I use += with a two-dimensional array in PowerShell?

Definitely check out the post from quarterball, as using collections is usually faster and more reliable than sticking with regular arrays or ArrayLists.

Using `+=` for adding to arrays is generally not recommended. Instead, consider using a collection with the `.Add` method. Here's an example:

```powershell
$MyArray = [System.Collections.Generic.List[Object]]::new()
$MyArray.Add($stuff)
```

This method can significantly improve performance and allows better control over the data type of your collection. If you're using PowerShell 7.5 or newer, you might find that `+=` is actually faster for object arrays in certain scenarios.

Try running `Get-Member` on your array to see what methods are available. A simple way to add entries could be `array.add("your data")`, but make sure to encapsulate your content into a variable for better organization.

Go for direct assignment instead of using `+=`. It’s much more efficient when handling array sizes.

You might want to look into HashTables for your two-dimensional structure. Here's a link for more information on how to use them: https://learn.microsoft.com/en-us/powershell/scripting/learn/deep-dives/everything-about-hashtable?view=powershell-7.5.