# RE: [PHP] longitude/latitude function

```Thanks, Just curious because after looking online it seems there are several
ways to do this...many giving a slightly different answer...for example, I
went to mapquest and put in two cities and the mileage was 1500, the
function returned 1700.  Also, the function says it prints in miles and kms
but it only seems to print one of them...do you know which one?  I guess I
should look at the freshmeat site before I bother you with any other
questions.```
```
Thanks again!!!
Eddie

-----Original Message-----
Sent: Friday, November 15, 2002 11:50 AM
To: Edward Peloke; [EMAIL PROTECTED]
Subject: Re: [PHP] longitude/latitude function

I got that from http://freshmeat.net/projects/zipdy/?topic_id=66.  It's a
program called Zipdy that does these calculations.  There's also a similar
function on the US government census site (can't remember where though), but
I liked Zipdy's better.

--
Aaron Gould
[EMAIL PROTECTED]
Web Developer

----- Original Message -----
From: "Edward Peloke" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, November 15, 2002 11:55 AM
Subject: RE: [PHP] longitude/latitude function

> 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
> >
> >
> > --
> > PHP General Mailing List (http://www.php.net/)
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>
>
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```