Php calculates the distance between two points of geographic coordinates, and php two points of geographic coordinates

Php calculates the distance between two points of geographic coordinates, and php two points of geographic coordinates

Function:The spherical distance between two points is calculated based on the circumference rate and the latitude and longitude of the earth's radius coefficient and the two-point coordinate.


Obtain the two-point coordinate distance:

<? Php/*** calculate the distance between two geographical coordinates * @ param Decimal $ longitude1 start longitude * @ param Decimal $ latitude1 start latitude * @ param Decimal $ longitude2 end longitude * @ param Decimal $ latitude2 end latitude * @ param Int $ unit 1: meters 2: Km * @ param Int $ decimal precision reserved Decimal places * @ return decimal */function getDistance ($ longitude1, $ latitude1, $ longitude2, $ latitude2, $ unit = 2, $ decimal = 2) {$ EARTH_RADIUS = 6370.996; // Earth radius coefficient $ PI = 3.1415926; $ radLat1 = $ lat Itude1 * $ PI/180.0; $ radLat2 = $ latitude2 * $ PI/180.0; $ radLng1 = $ longitude1 * $ PI/180.0; $ radLng2 = $ longitude2 * $ PI/180.0; $ a = $ radLat1-$ radLat2; $ B = $ radLng1-$ radLng2; $ distance = 2 * asin (sqrt (pow (sin ($ a/2), 2) + cos ($ radLat1) * cos ($ radLat2) * pow (sin ($ B/2), 2); $ distance = $ distance * $ EARTH_RADIUS * 1000; if ($ unit = 2) {$ distance = $ distance/1000;} return round ($ distance, $ Decimal);} // start coordinate $ longitude1 = 113.330405; $ latitude1 = 23.147255; // end coordinate $ longitude2 = 113.314271; $ latitude2 = 23.1323; $ distance = getDistance ($ longitude1, $ latitude1, $ longitude2, $ latitude2, 1); echo $ distance. 'M'; // 2342.38 m $ distance = getDistance ($ longitude1, $ latitude1, $ longitude2, $ latitude2, 2); echo $ distance. 'km '; // 2.34?>

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