How to assign multiple selected checkboxes to individual variables

If the user is supposed to select 3 different cars, how would I take those three car values and assign them to different variables in php?

<input type="checkbox" name="car[]" value = "van">van <br>
<input type="checkbox" name="car[]" value = "crv">crv <br>
<input type="checkbox" name="car[]" value = "sedan">sedan<br>
<input type="checkbox" name="car[]" value = "suv">suv <br>
<input type="checkbox" name="car[]" value = "truck">truck <br>