Return associative array for Scenario Facility Staff Resource Requirements

we have this search happening inside of an existing array of facility groups:

foreach ($this->scenarioFacilityGroup as $group) {
          foreach ($group->getAgScenarioFacilityResource() as $scenarioFacilityResource) {
            foreach ($this->staffResourceTypes as $srt) {

the $this->scenarioFacilityGroup array lets us do things like this:

$formsArray[$subKey][$subSubKey][$srt->staff_resource_type]

which means we can operate intelligently, so we can do:

if (isset($EXISTINGArray[$subKey][$subSubKey][$srt->staff_resource_type]))

... instead of having to do that inside of the loop.