usort multidimensional array - two key - Please help!

[szym9341]

Please help... I would like to sort the following array by the "make" AND the "model"... it currently sorts by "make" just fine.

//Function
function sortColumn($a, $b)
{
   return strcmp($a["make"], $b["make"]);
}

//Array
$cars = array(
  array('make' => 'Ford', 'model' => 'F250'),
  array('make' => 'Honda', 'model' => 'Civic'),
  array('make' => 'Honda', 'model' => 'Accord'),
  array('make' => 'Ford', 'model' => 'F150'),
  );

//Run usort
usort($cars, 'sortColumn');

//Display
foreach($cars as $a) {
  echo $a["make"] . ' ' . $a["model"] . '<br>';
}

The results are:
Ford F250
Ford F150
Honda Civic
Honda Accord

I would like the "models" to be sorted also. Any ideas??

[Installer]

foreach ($cars as $key => $value) {
    $makes[$key] = $value['make'];
    $models[$key] = $value['model'];
}
array_multisort($makes, $models, $cars);
foreach($cars as $a) { 
  echo $a['make'] . ' ' . $a['model'] . '<br>'; 
}

[szym9341]

Thank you! Works Great.