PHP calculates the distance of two points of geographic coordinates

Function: Calculates the spherical distance between two points according to the latitude and longitude of pi and earth radius coefficients and coordinates of two points.
Get two point coordinate distance:

    /** * Calculates the distance between two points of geographic coordinates * @param decimal $longitude 1 beginning Longitude * @param decimal $latitude 1 beginning latitude * @par Am Decimal $longitude 2 End Longitude * @param Decimal $latitude 2 End latitude * @param Int $unit Unit 1 : M 2: km * @param Int $decimal precision reserved decimal number * @return decimal * / functiongetdistance($longitude 1, $latitude 1, $ Longitude2, $latitude 2, $unit=2, $decimal=2){ $EARTH _radius=6370.996;//Earth radius coefficient$PI=3.1415926;$radLat 1=$latitude 1*$PI/180.0;$radLat 2=$latitude 2*$PI/180.0;$radLng 1=$longitude 1*$PI/180.0;$radLng 2=$longitude 2*$PI/180.0;$a=$radLat 1-$radLat 2;$b=$radLng 1-$radLng 2;$distance=2* ASIN (SQRT (Pow (sin ($a/2),2) + cos ($radLat 1) * COS ($radLat 2) * POW (sin ($b/2),2)));$distance=$distance*$EARTH _radius* +;if($unit==2){$distance=$distance/ +; }returnRound$distance,$decimal);}//Start coordinates$longitude 1=113.330405;$latitude 1=23.147255;//Terminal coordinates$longitude 2=113.314271;$latitude 2=23.1323;$distance= Getdistance ($longitude 1,$latitude 1,$longitude 2,$latitude 2,1);Echo$distance.' m ';//2342.38m$distance= Getdistance ($longitude 1,$latitude 1,$longitude 2,$latitude 2,2);Echo$distance.' km ';//2.34km?>

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