PHP :: How To Send String From AS3 For Database Query

Im building this AIR app on Flash CS5, and I have this TileList that loads its data (images and names) from a database. I want to do a query with the name any item of the Tilelist when its clicked, so i need to send the name of that item to a PHP file that will execute the query. I am thinking of a function that loads the item name to a variable when the item is clicked. How can I send it to the PHP file and how would I load it to the query? The query I want on the php file goes something like this: Select lat, lon from mapdata where name=theVariable;