```php /** * * 根据两点的经纬度计算距离 * @author zhengshaozhuo * @version 2015-08-10 */ function calc_distance_by_pos($o_lat, $o_lng, $t_lat, $t_lng){ $pk = 180 / 3.14169; $_a1 = $o_lat / $pk; $_a2 = $o_lng / $pk; $_b1 = $t_lat / $pk; $_b2 = $t_lng / $pk; $t1 = cos($_a1) * cos($_a2) * cos($_b1) * cos($_b2); $t2 = cos($_a1) * sin($_a2) * cos($_b1) * sin($_b2); $t3 = sin($_a1) * sin($_b1); $tt = acos($t1 + $t2 + $t3); return (int)(6366000 * $tt); } ```