PHP has latitude and longitude calculation distance

/** *  @desc 根据两点间的经纬度计算距离 *  @param float $lat 纬度值 *  @param float $lng 经度值 */   function getDistance( $lat1 ,  $lng1 ,  $lat2 ,  $lng2 )   {       $earthRadius = 6367000;  //approximate radius of earth in meters       /*         Convert these degrees to radians         to work with the formula       */       $lat1 = ( $lat1 * pi() ) / 180;       $lng1 = ( $lng1 * pi() ) / 180;       $lat2 = ( $lat2 * pi() ) / 180;       $lng2 = ( $lng2 * pi() ) / 180;       /*         Using the         Haversine formula         http://en.wikipedia.org/wiki/Haversine_formula         calculate the distance       */       $calcLongitude =  $lng2 -  $lng1 ;       $calcLatitude =  $lat2 -  $lat1 ;       $stepOne = pow(sin( $calcLatitude / 2), 2) +  cos ( $lat1 ) *  cos ( $lat2 ) * pow(sin( $calcLongitude / 2), 2);   $stepTwo = 2 * asin(min(1, sqrt( $stepOne )));       $calculatedDistance =  $earthRadius *  $stepTwo ;       return round ( $calculatedDistance );   }

With an online calculation of two-point distance address:

Http://www.nhc.noaa.gov/gccalc.shtml

Note: Original link: http://my.oschina.net/ekc/blog/84106

PHP has latitude and longitude calculation distance