Trouble with list building from database

[CtownCreep]

I guess I'll start with the goal. I need to build an ordered list based on items selected in a dropdown menu and I need to combine those items' corresponding addresses together to build a link to google maps.
In my database, I have a table with columns for id, name, and address. Based on which option from the dropdown is selected, the submit button should create an <li> element with the name of the place in it, and it should be putting that place's address somewhere so that the next time the submit button is clicked, the next address can be added to it.

I guess I'm stuck wondering how to have a variable that doesn't initialize back to zero when the submit button is clicked so I can concatenate them.

I'm very new to this and I'm not sure if this is the most efficient way to do it.
If anybody has any suggestions as for how this should be done (pseudocode, perhaps?), it would be greatly appreciated.

[bpat1434]

If you're submitting a form, why not have hidden fields with the name of "previous[]" so that when you process it, you can test if $POST['previous'] is empty. If it's empty, then there were no previous addresses; otherwise, iterate over $POST['previous'] to get all the previous addresses.

<?php
if(!empty($_POST['previous']))
{
    foreach($_POST['previous'] as $previous)
    {
        // Do something with it here
    }
}

The other option is the use of sessions. You can store the previous form submissions in the session and call on them later if need be.

[Randall01]

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