例子一
function distance($lat1, $lng1, $lat2, $lng2, $miles = true)
{
$pi80 = M_PI / 180;
$lat1 *= $pi80;
$lng1 *= $pi80;
$lat2 *= $pi80;
$lng2 *= $pi80;
$r = 6372.797;
$dlat = $lat2 - $lat1;
$dlng = $lng2 - $lng1;
$a = sin($dlat/2)*sin($dlat/2)+cos($lat1)*cos($lat2)*sin($dlng/2)*sin($dlng/2);
$c = 2 * atan2(sqrt($a), sqrt(1 - $a));
$km = $r * $c;
return ($miles ? ($km * 0.621371192) : $km);
}
例子二
/**
* 计算两个坐标之间的距离(米)
* @param float $fP1Lat 起点(纬度)
* @param float $fP1Lon 起点(经度)
* @param float $fP2Lat 终点(纬度)
* @param float $fP2Lon 终点(经度)
* @return int
*/
function distanceBetween($fP1Lat, $fP1Lon, $fP2Lat, $fP2Lon){
$fEARTH_RADIUS = 6378137;
//角度换算成弧度
$fRadLon1 = deg2rad($fP1Lon);
$fRadLon2 = deg2rad($fP2Lon);
$fRadLat1 = deg2rad($fP1Lat);
$fRadLat2 = deg2rad($fP2Lat);
//计算经纬度的差值
$fD1 = abs($fRadLat1 - $fRadLat2);
$fD2 = abs($fRadLon1 - $fRadLon2);
//距离计算
$fP = pow(sin($fD1/2), 2) +
cos($fRadLat1) * cos($fRadLat2) * pow(sin($fD2/2), 2);
return intval($fEARTH_RADIUS * 2 * asin(sqrt($fP)) + 0.5);
}
/**
* 百度坐标系转换成标准GPS坐系
* @param float $lnglat 坐标(如:106.426, 29.553404)
* @return string 转换后的标准GPS值:
*/
function BD09LLtoWGS84($fLng, $fLat){ // 经度,纬度
$lnglat = explode(",", $lnglat);
list($x,$y) = $lnglat;
$Baidu_Server = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x={$x}&y={$y}";
$result = @file_get_contents($Baidu_Server);
$json = json_decode($result);
if($json->error == 0){
$bx = base64_decode($json->x);
$by = base64_decode($json->y);
$GPS_x = 2 * $x - $bx;
$GPS_y = 2 * $y - $by;
return $GPS_x.",".$GPS_y;//经度,纬度
}else
return $lnglat;
}
php计算两个日期之间的天数_php计算两个坐标（经度，纬度）之间距离的方法
http://m.bbyears.com/wangyetexiao/99767.html
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