php计算两经纬点距离

分类: php 发布时间: 2015-03-20 11:46 浏览: 556 次

// Using the Haversine formula http://en.wikipedia.org/wiki/Haversine_formula calculate the distance

/**
* 根据两点间的经纬度计算距离 单位:米
*
* @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;

$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 );
}

如果觉得我的文章对您有用,请随意打赏。您的支持将鼓励我继续创作!