# Re: [PHP] longitude/latitude function

```Edward:

We use a dealer locator.  I would suggest one thing if you have
a lot of data, hits, namely to pre-calculate the lat/long in
up the script.```
```
_justin

Edward Peloke wrote:
>
> Thanks Aaron,
>
> If you don't mind me asking, where did you get it?  It seems to give a
> better answer than my function.
>
> Thanks!
> Eddie
>
> -----Original Message-----
> Sent: Friday, November 15, 2002 11:04 AM
> To: Edward Peloke; [EMAIL PROTECTED]
> Subject: Re: [PHP] longitude/latitude function
>
> Try this snippet... I can't vouch for its accuracy since I am not a
> mathematician:
>
> <?
> // Function takes latitude and longitude  of two places as input
> // and prints the distance in miles and kms.
> function calculateDistance(\$lat1, \$lon1, \$lat2, \$lon2)
>     // Convert all the degrees to radians
>
>     // Find the deltas
>     \$delta_lat = \$lat2 - \$lat1;
>     \$delta_lon = \$lon2 - \$lon1;
>
>     // Find the Great Circle distance
>     \$temp = pow(sin(\$delta_lat / 2.0), 2) + cos(\$lat1) * cos(\$lat2) *
> pow(sin(\$delta_lon / 2.0), 2);
>
>
>     \$distance = (\$EARTH_RADIUS * 2 * atan2(sqrt(\$temp), sqrt(1 - \$temp)) *
> 1.6093);
>
>     return \$distance;
> }
> ?>
>
> --
> Aaron Gould
> [EMAIL PROTECTED]
> Web Developer
>
> ----- Original Message -----
> From: "Edward Peloke" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Friday, November 15, 2002 11:20 AM
> Subject: [PHP] longitude/latitude function
>
> > Has anyone ever written a php function to take the longitude and latitude
> of
> > two destinations and calculate the distance?
> >
> > I am working on one but the output is just a little off.
> >
> > Thanks,
> > Eddie
> >
> >
> > --
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>
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--
Justin Farnsworth
Eye Integrated Communications
321 South Evans - Suite 203
Greenville, NC 27858 | Tel: (252) 353-0722

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```