public function getDiscount(){
$r = 6378.137; // 地球半径
$radLat1 = $this->rad($locallat);//当前纬度
$radLat2 = $this->rad($v['latitude']);//加油站纬度
$lat = $radLat1 - $radLat2;
$long = $this->rad($locallng) - $this->rad($v['longitude']);
$s = 2 * asin(sqrt(pow(sin($lat/2), 2) + cos($radLat1)*cos($radLat2)*pow(sin($long/2), 2)));
$s = $s * $r;
$distance=round($s * 10) / 10;
if($distance<1){
$distanceMeter=$distance*1000;
$list[$k]['distance']=$distanceMeter.'米';
}else{
$list[$k]['distance']=$distance.'公里';
}
}
function rad($d, $pi = 3.14) {
return $d * $pi / 180.0;
}
