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

Source: Internet
Author: User

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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