Obtain from the coordinates

function get_two_point_distance ($ lat1, $ lat2 , $ lng1, $ lng2) // distance distribution calculation, 
{ 
    $ radLat1 deg2rad = ($ LAT1); // deg2rad () function converts degrees to radians 
    $ radLat2 = deg2rad ($ lat2) ; 
    $ radLng1 = deg2rad ($ LNG 1); 
    $ radLng2 = deg2rad ($ lng2); 
    $ A = $ radLat1 - $ radLat2; 
    $ B = $ radLng1 - $ radLng2; 
    $ S = 2 * ASIN (sqrt (POW (SiN ( A $ / 2), 2) + COS ($ radLat1) * COS ($ radLat2) * POW (SiN ($ B / 2), 2))) * 6378.137; 
    return round ($ S, 2); // returns a few kilometers 
} 


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