Multidimensional arrays

<?php
$cars = array(
  "car1" => array("make" => "Toyota","colour" => "Green","year" => 1999,"engine_cc" => 1998),
  "car2" => array("make" => "BMW","colour" => "RED","year" => 2005,"engine_cc" => 2400),
  "car3" => array("make" => "Renault","colour" => "White","year" => 1993,"engine_cc" => 1395),
);
?>
In this example, if you were to use:

<?php
  echo "$cars['car1']['make']<br>";
  echo "$cars['car3']['engine_cc']";
?>
The output would be:

Toyota
1395