php 2个坐标位置直接距离,php计算两个坐标距离

function distance($lng1, $lat1, $lng2, $lat2, $len_type = 1, $decimal = 2)

{

$radLat1 = $lat1 * PI() / 180.0;

$radLat2 = $lat2 * PI() / 180.0;

$a = $radLat1 - $radLat2;

$b = ($lng1 * PI() / 180.0) - ($lng2 * PI() / 180.0);

$s = 2 * asin(sqrt(pow(sin($a/2),2) + cos($radLat1) * cos($radLat2) * pow(sin($b/2),2)));

$s = $s * 6378.137;

$s = round($s * 1000);

if ($len_type == 1) // 1 kilometer / 2 meter

{

$s /= 1000;

}

return round($s, $decimal);

}

用法：distance(坐标1经度，坐标1纬度，坐标2经度，坐标2纬度，[可选，1/2,千米/米]，[精确小数位，默认2])

如：echo distance(120.389014,36.073233,116.381272,39.914271);

553.44 // 千米

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