在PHP循环中计算多个经度/经度之间的多重距离

function calculateDistance($lat1, $lon1, $lat2, $lon2) {
    $earthRadius = 6371; // 地球半径，单位为千米

    $lat1 = deg2rad($lat1);
    $lon1 = deg2rad($lon1);
    $lat2 = deg2rad($lat2);
    $lon2 = deg2rad($lon2);

    $deltaLat = $lat2 - $lat1;
    $deltaLon = $lon2 - $lon1;

    $a = sin($deltaLat / 2) * sin($deltaLat / 2) + cos($lat1) * cos($lat2) * sin($deltaLon / 2) * sin($deltaLon / 2);
    $c = 2 * atan2(sqrt($a), sqrt(1 - $a));

    $distance = $earthRadius * $c;

    return $distance;
}

// 示例数据
$locations = array(
    array('lat' => 40.712776, 'lon' => -74.005974), // 纽约
    array('lat' => 34.052235, 'lon' => -118.243683), // 洛杉矶
    array('lat' => 51.5074, 'lon' => -0.1278), // 伦敦
    // 可以继续添加更多的经度/纬度数据
);

$origin = array('lat' => 37.7749, 'lon' => -122.4194); // 起始点，例如旧金山

foreach ($locations as $location) {
    $distance = calculateDistance($origin['lat'], $origin['lon'], $location['lat'], $location['lon']);
    echo "距离起始点的距离：" . $distance . "千米\n";
}