add variable to array object at runtime

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is it possible to add new variable to a array object at run time?
the following code does not work.
$iterator->current()->['newProperty'] = 1234;

how can this be done?

function bandingCalculator($properties){

            $iterator = $properties->getIterator();

            while ( $iterator->valid() ){
                  if ( 0 == strcmp($iterator->current()-
Quoted text here. Click to load it
                        $iterator->current()->BAND_ASSESSMENT = 666;
                        $iterator->current()->['newProperty'] = 1234;

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