PHP database option selection and website display

PHP database content dynamically displayed on webpage The website selector will display 3 variables from the database. As each choice is made, the next selector will display the previous choices' category content. On the final selection the sequence needs to be displayed on the webpage along with a final output of content and links from the database. This string of content needs to then be carried on to additional pages for display and input into forms. Example: Selector 1 choice: Toyota, Honda, Nissan when the selection is chosen it will show only cars from that category on the 2nd selector: Selection is made for **Toyota** = Selector 2 display: Camry, Corolla, Tacoma, etc? When the selection is made for **Camry** = 3rd category information is displayed. When the final selection is made the <database content> will be displayed. When the user clicks on the <database content> link the info will fill in a form with <category 1 selection> <category 2 selection > <category 3 selection > <database content> on the following page. Project Summary: The 3 variable selectors must be able to have an unlimited number of options and they must change to the relevant content based off of the previous selections. After this is achieved the content must be able to be displayed on additional php pages including information saved into a form.