php实现计算百度地图坐标之间距离的方法 阿星小栈

/** * 计算两个坐标之间的距离(米) * @param float $fP1Lat 起点(纬度) * @param float $fP1Lon 起点(经度) * @param float $fP2Lat 终点(纬度) * @param float $fP2Lon 终点(经度) * @return int */function distanceBetween($fP1Lat, $fP1Lon, $fP2Lat, $fP2Lon){ ???$fEARTH_RADIUS = 6378137; ???//角度换算成弧度 ???$fRadLon1 = deg2rad($fP1Lon); ???$fRadLon2 = deg2rad($fP2Lon); ???$fRadLat1 = deg2rad($fP1Lat); ???$fRadLat2 = deg2rad($fP2Lat); ???//计算经纬度的差值 ???$fD1 = abs($fRadLat1 - $fRadLat2); ???$fD2 = abs($fRadLon1 - $fRadLon2); ???//距离计算 ???$fP = pow(sin($fD1/2), 2) + ?????????cos($fRadLat1) * cos($fRadLat2) * pow(sin($fD2/2), 2); ???return intval($fEARTH_RADIUS * 2 * asin(sqrt($fP)) + 0.5);}/** * 百度坐标系转换成标准GPS坐系 * @param float $lnglat 坐标(如:106.426, 29.553404) * @return string 转换后的标准GPS值: */function BD09LLtoWGS84($lnglat){ // 经度,纬度 ???$lnglat = explode(‘,‘, $lnglat); ???list($x,$y) = $lnglat; ???$Baidu_Server = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x={$x}&y={$y}"; ???$result = @file_get_contents($Baidu_Server); ???$json = json_decode($result); ???if($json->error == 0){ ???????$bx = base64_decode($json->x); ???????$by = base64_decode($json->y); ???????$GPS_x = 2 * $x - $bx; ???????$GPS_y = 2 * $y - $by; ???????return $GPS_x.‘,‘.$GPS_y;//经度,纬度 ???}else ???????return $lnglat;}