If I understand properly then you can do something like this:

float $timeArray[] = {};
float $valueArray[] = {};

int $nextIndex = size($timeArray);
float $currentTime = `currentTime -q`;

string $myObject = "pCube1";

$timeArray[$nextIndex] = $currentTime;
$valueArray[$nextIndex] = `getAttr -t $currentTime ($myObject + ".tx")`;



A