How to make cascading drop-down lists using mysql and php

Question

I have to make a form with multiple drop-down menus that modify one another. The menus/database tables are:

Categories, Styles, Types, and Mechanisms

I have

Answer 1

Finally just had to figure it out on my own, but thanks for those who tried to help.

I will post my middle table from my Class/Category/Style/Type cascading tables. First make a function such as the below:

 ".$name.'';
            }
        } else {
            $options.="First Select Class";
        }
        return($options);
    }
?>

Then place on your main page:

    //Category
    if(isset($_GET['category_id'])) {
        $category_id=$_GET['category_id'];
        setcookie('category_id',$category_id);
        $link.="&category_id={$category_id}";
    }elseif(isset($_COOKIE['category_id'])) {
        $_GET['category_id']=$_COOKIE['category_id'];
        $category_id=$_COOKIE['category_id'];
        $link.="&category_id={$category_id}";
    }

Now make your selection drop-down:

Repeat above for each required drop-down.

Good luck...and, of course use MYSQLi to protect your site rather than the MYSQL shown above...