php in_array
$cars = array(array("Volvo", 22, 18), array("BMW", 15, 13), array("Saab", 5, 2), array("Land Rover", 17, 15));
$cars = array( //Same thing as above execept it is more readable
array("Volvo", 22, 18),
array("BMW", 15, 13),
array("Saab", 5, 2),
array("Land Rover", 17, 15)
);
echo $cars[0][0] . ", " . $cars[0][1]; //Outputs: Volvo, 22