关于距离排序的问题

$sql =  "select id,xpoint,ypoint, deal_cate_id,ratio  from ".DB_PREFIX."supplier_location where ".$where;

foreach($info as $k=>$v){			   	$info[$k]['Distance']  =intval(GetDistance($ypoint,$xpoint,$v['ypoint'],$v['xpoint'])*1000);}

// 本函数为获取两坐标之间的距离 // a纬度 a经度 b纬度 b经度 function GetDistance($lat1, $lng1, $lat2, $lng2)   {       $EARTH_RADIUS = 6378.137;	$radLat1 = rad($lat1);	$radLat2 = rad($lat2);	$a = $radLat1 - $radLat2;	$b = rad($lng1) - rad($lng2);       $s = 2 * asin(sqrt(pow(sin($a/2),2) + cos($radLat1)*cos($radLat2)*pow(sin($b/2),2)));    $s = $s * $EARTH_RADIUS;     $s = round($s * 10000) / 10000;    return $s;}