Neither PHP nor MySQL, but Javascript:
http://maps.forum.nu/gm_resize_viewport.html

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Marcelo - http://maps.forum.nu
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On Jul 30, 9:53 am, Dexter Weiss <[email protected]> wrote:
> Hello everyone,
>
> I've just begun posting here, but I must say you all have been most
> helpful.  I am very new to the google maps API, so thanks to all who
> have taken the time to answer my questions.
>
> I find myself at yet another impasse as I try to set a point at the
> center of the map, and then fix the window zoon to show only a
> specific number of miles in radius from that point.
>
> I know I need to use the Haversine formula with distance and one lat
> and long point as input.  However, I can't for the life of me
> understand it well enough to write it in PHP or MySql.  Does anyone
> know where I can get some sample code?
>
> Thanks
>
> -D
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