Syntax for Multisort Filter
For those of you reading through this post, I thought it might be useful to provide a bit of background on my question. The Craft Docs list "multisort" under Filters and it sounded like something that would work nicely for me. However, the Craft Docs do not give an example, instead directing the reader to Yii docs. Those docs confirmed it was exactly what I needed - sorting an array by a given key, descending, numeric. However, the syntax does not make sense in term of using it within a template.

Here is the answer from Brad and Andrew, which works great:

{% for rides in allRides|multisort(['eventDate'],['SORT_DESC'],['SORT_REGULAR']) %}


Here is what you will find on the Yii docs page :

public static void multisort ( &amp;$array, $key, $direction = SORT_ASC, $sortFlag = SORT_REGULAR )


I suppose if you are a php wizard, which, as you might have guessed, I am not, you might figure this out on your own. Having said that, it would save many of us lots of time if the Craft docs simply included the example that Brad was kind enough to provide.