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  1. #1
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    Calculate distance with variable lat and lon values

    Hi

    I have a problem with implementing variables into a function that calculate distance between 2 latitudes, longitudes.
    One of them is constant, and the second one being passed from the form.

    Here is the code:

    PHP Code:
    $lon1 $_POST['lon1']; 
            
    $lat1 $_POST['lat1']; 
            
    $lon2 '-0.30020239'
            
    $lat2 '51.58734910'
             
    function 
    distance($lat11$lon11$lat22$lon22) {  
            
    $theta $lon11 $lon22;  
            
    $dist sin(deg2rad($lat11)) * sin(deg2rad($lat22)) +  cos(deg2rad($lat11)) * cos(deg2rad($lat22)) * cos(deg2rad($theta));  
            
    $dist acos($dist);  
            
    $dist rad2deg($dist);  
            
    $miles $dist 60 1.1515
                    return 
    $miles


    echo 

    $lon1$lat1<br> 
    $lon2$lat2<br>"
    //////////  return good calculation 
    echo distance(52.611644, -0.2630451.58734910, -0.30020239) . " miles<br>"

    ////////// my way - return wrong calculation  
    echo distance("$lon1""$lat1"51.58734910, -0.30020239) . " miles<br>"
    As long as i have lat, lon values hardcoded is fine, but idea is to have this calculation done from variables.
    Both will vary .... tried different configurations ... i'm losing it ...

    How should I code it ??

    Thanks for your help in advance!

  2. #2
    SitePoint Enthusiast
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    There was a problem in calling a distance() function. Function is defined as lat, lon, lat, lon, but i called it as lon, lat, lon, lat.

    Being blind.

    SOLVED.


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