Displaying data for only the visible map area using php mapscript

[Blammo]

Arunoday Chatterjee wrote:

>I'm trying to develop this map with counties for a particular state, with
>major highways and
>secondary highways and streets. Streets is something that i want to
>display when the map is
>zoomed into to a certain level. Problem is that i'm not being able to load
>street data for only the visible area of the map as a result of which
>apache is failing to process as the
>street data is enormously huge. Since it is just zooming i'm unable to get
>any parameter to filter street data by.
>Can anyone let me know how to do this, basically display data of a layer
>for only the visible area in the map.
>I'm using php mapscript 4.2.3.
>
>
>
>
You may need to tile up the data into smaller chunks, and then use a
tileindex to access only those tiles of data within the current view.

bobb