Writing functions in php

Writing functions in php  for inserting data  in mysql using php

$car_class="bmw";
$description="nice car";

$car_class and $description are the variable which are being passed to function for inserting data in database.


insert_class_car($car_class,$description);


insert_class_car($car_class,$description);

above syntax is calling function,

function insert_class_car($car_class,$description)
{
$car_class_1=$car_class;
$description_1=$description;

$query=mysql_query("Insert Into car_class(id,class_name,description,is_del)values('','$car_class_1','$description_1','approved')") or die(mysql_error());
}

above syntax is body of fucnction.