How to join arrays in ascending order with Unique array

Question

Good is the following I have the following code:

$cars = array("Volvo", "BMW", "Toyota", "BMW", "Ferrari");
$cars2 = array_unique($cars);

echo $cars2[0];
echo "<br><br>";
echo $cars2[1];
echo "<br><br>";
echo $cars2[2];
echo "<br><br>";
echo $cars2[3];

Me showing the $cars2[3], show me a mistake, but in theory I wanted you to show me the Ferrari, or how can I join the arrays, excluding the repeated, and arrays have always worked.

How can I do that?

Answer 1

$cars  = array("Volvo", "BMW", "Toyota", "BMW", "Ferrari");
$cars2 = array_unique($cars);
$cars2 = array_values($cars2);

print_r($cars2);