背景：
我目前正在使用Google Directions API这样计算往返距离：
A -> B -> C -> A
基本上总是3个位置。起点和终点相同，并且有2个航点。我用这个电话：
https://maps.googleapis.com/maps/api/directions/json?
mode=walking
&origin=41.445678,-72.018184 // Location A
destination=41.445678,-72.018184 // Location A
&waypoints=via:41.439271,-72.042239|via:41.414976,-72.018970 // Location B & C
&key=API_KEY
然后我得到了总距离：
$distance = $directions->routes[0]->legs[0]->distance->value / 1000;
问题：
现在，我正在尝试在同一个通话中也仅获得与B -> C的距离，基本上仅是2个航路点之间的距离。问题是，如果不进行单独的通话（因此要支付两次），我将无法解决该问题。
当我返回结果时，它看起来像这样：
{
"geocoded_waypoints" : [
{
"geocoder_status" : "OK",
"place_id" : "ChIJPSCqu8h05okRs9KY748Yquo",
"types" : [ "establishment", "finance", "point_of_interest", "post_office" ]
},
{
"geocoder_status" : "OK",
"place_id" : "ChIJX8nJxlQL5okROb_esXXtTeA",
"types" : [ "premise" ]
},
{
"geocoder_status" : "OK",
"place_id" : "ChIJLyy-zhUL5okRufacS3f2QDw",
"types" : [ "premise" ]
},
{
"geocoder_status" : "OK",
"place_id" : "ChIJPSCqu8h05okRs9KY748Yquo",
"types" : [ "establishment", "finance", "point_of_interest", "post_office" ]
}
],
"routes" : [
{
"bounds" : {
"northeast" : {
"lat" : 41.4456777,
"lng" : -72.01399409999999
},
"southwest" : {
"lat" : 41.4133016,
"lng" : -72.0422671
}
},
"copyrights" : "Map data ©2019 Google",
"legs" : [
{
"distance" : {
"text" : "6.1 mi",
"value" : 9878
},
"duration" : {
"text" : "2 hours 3 mins",
"value" : 7356
},
"end_address" : "764 Colonel Ledyard Hwy, Ledyard, CT 06339, USA",
"end_location" : {
"lat" : 41.4456777,
"lng" : -72.0181729
},
"start_address" : "764 Colonel Ledyard Hwy, Ledyard, CT 06339, USA",
"start_location" : {
"lat" : 41.4456777,
"lng" : -72.0181729
},
"steps" : [
{
"distance" : {
"text" : "13 ft",
"value" : 4
},
"duration" : {
"text" : "1 min",
"value" : 4
},
"end_location" : {
"lat" : 41.4456444,
"lng" : -72.0181743
},
"html_instructions" : "Head \u003cb\u003esouth\u003c/b\u003e on \u003cb\u003eCT-117 S\u003c/b\u003e toward \u003cb\u003eCT-214 E\u003c/b\u003e",
"polyline" : {
"points" : "oz}{Fp`qvLF?"
},
"start_location" : {
"lat" : 41.4456777,
"lng" : -72.0181729
},
"travel_mode" : "WALKING"
},
{
"distance" : {
"text" : "1.1 mi",
"value" : 1830
},
"duration" : {
"text" : "21 mins",
"value" : 1286
},
"end_location" : {
"lat" : 41.4448953,
"lng" : -72.0388138
},
"html_instructions" : "Turn \u003cb\u003eright\u003c/b\u003e onto \u003cb\u003eCT-214 W\u003c/b\u003e",
"maneuver" : "turn-right",
"polyline" : {
"points" : "gz}{Fp`qvLl@nCJd@VbAHZDRDNFPDPHTL^FNHPRd@Xn@\\v@DHHRDNBL@D@F@FBN@P?P@PAR?RAT?p@?Z?X@ZB\\BZBRF^FZFVDRPh@^hAPj@Lb@Px@Lh@H`@Jp@H`@Hn@BR@N@N?NANAPAPCLCTGVGTGLCJELOZIPGNGNCJENELCNGZEXCVE^Ej@APAd@Ad@?d@@n@?hACr@AZCZEb@OfBGd@Eb@Ef@CREZGj@Eb@CRA\\?`@?d@@pABdA@^FhBBZBZHh@N`AD^@RBT?R?LAL?HEZCREVEROn@EVMt@CNETCXEZIj@Gd@E`@CPCNETEPGPKTINMP"
},
"start_location" : {
"lat" : 41.4456444,
"lng" : -72.0181743
},
"travel_mode" : "WALKING"
},
{
"distance" : {
"text" : "0.5 mi",
"value" : 728
},
"duration" : {
"text" : "9 mins",
"value" : 548
},
"end_location" : {
"lat" : 41.4392546,
"lng" : -72.0422671
},
"html_instructions" : "Turn \u003cb\u003eleft\u003c/b\u003e onto \u003cb\u003eWhalehead Rd\u003c/b\u003e",
"maneuver" : "turn-left",
"polyline" : {
"points" : "su}{FpauvL`@THDJBJBHBF@J@N@ZDVDR@f@D\\BV@V?XATAP?PA\\@V@VB`@Dd@Fn@HNBHBHBHBFDHFFDRNPNXTNNRPRNp@l@ZV`@^\\XJLLLHLHNDNBHHPFRFTHRFNBFBFDFDFFJJLX^PVX^"
},
"start_location" : {
"lat" : 41.4448953,
"lng" : -72.0388138
},
"travel_mode" : "WALKING"
},
{
"distance" : {
"text" : "2.2 mi",
"value" : 3595
},
"duration" : {
"text" : "46 mins",
"value" : 2735
},
"end_location" : {
"lat" : 41.4133016,
"lng" : -72.0189894
},
"html_instructions" : "Turn \u003cb\u003eleft\u003c/b\u003e onto \u003cb\u003eSandy Hollow Rd\u003c/b\u003e",
"maneuver" : "turn-left",
"polyline" : {
"points" : "ir|{FdwuvLf@O\\M\\OZOFCFEJGFIHIFKJSL[Ra@|@sBXm@V_@HKJMDEBCJIHGZOr@[p@YXOn@_@PMJIFGFGDEBEDGBE@EDGBGRo@L_@Na@Rc@Pa@HQHMHQ|@aBTa@Tc@N]Rg@f@oAj@_BPk@HSDIJQDIBEJOX_@FIPOPOVUNIn@_@VOr@_@~@g@\\Sb@WTOb@]LKRQZ]RUFI`@g@LO`@g@X_@z@aAV[FIBCHKVUVSTSPMpA}@dAw@LIhAw@l@a@vAeAj@a@hA{@n@a@tAcAbAs@z@o@lAy@^YlAy@d@_@d@[pBwAb@[rA_AxDoCXQXOHE\\OHENEZKTEDAHAPC`@Eb@E|@EnAG\\CPALAJCJATEPEJEPIXO^Wl@a@\\Sd@[f@[~@k@pAy@NGJELGLCVE`AKpAMv@KNEJCTIHEHELKHGRS`@c@X[h@s@fA_BhAcBx@kA~@uAbAyAHKFKJWJYF]Hc@DOBWHk@@YBW"
},
"start_location" : {
"lat" : 41.4392546,
"lng" : -72.0422671
},
"travel_mode" : "WALKING"
},
{
"distance" : {
"text" : "2.3 mi",
"value" : 3721
},
"duration" : {
"text" : "46 mins",
"value" : 2783
},
"end_location" : {
"lat" : 41.4456777,
"lng" : -72.0181729
},
"html_instructions" : "Turn \u003cb\u003eleft\u003c/b\u003e onto \u003cb\u003eCT-117 N\u003c/b\u003e",
"maneuver" : "turn-left",
"polyline" : {
"points" : "cpw{FteqvLo@Bu@Bc@@o@?c@Ai@C]Ca@Ee@Gi@K[GsA]cDw@o@OcKeCiAYy@SkCm@c@Eg@CaACiA@wC?YCUCYCYGo@Qi@QkA_@y@YqKoDaDiAe@Og@Oa@OUGUG[IWE]E_AOuCc@qCa@kDg@kASk@Iu@K[Ca@Cw@Ag@BW@Q@c@D{ANi@DO@SBS@O@S@M?a@?Y?[?MAQAYCK?q@G[CYAM?W?M?G@E?G?I@G?I@G@G@UBKB{A^WF[FSDI@MBK@K@_@@q@B_A@e@?[@W@[@K@SBMBOBQFG@SF[LSHKFKHe@Zy@n@y@p@c@`@[VGD_@Za@\\YTWNSL[N[LQFQF}@T_AVaAXgAXkAZaDx@a@LgAZeBd@k@JKFK@MBQ@Q@WBWAG?"
},
"start_location" : {
"lat" : 41.4133016,
"lng" : -72.0189894
},
"travel_mode" : "WALKING"
}
],
"traffic_speed_entry" : [],
"via_waypoint" : [
{
"location" : {
"lat" : 41.4392734,
"lng" : -72.0422423
},
"step_index" : 2,
"step_interpolation" : 0.9959595432411245
},
{
"location" : {
"lat" : 41.4149736,
"lng" : -72.0189503
},
"step_index" : 4,
"step_interpolation" : 0.05009490732581229
}
]
}
],
"overview_polyline" : {
"points" : "oz}{Fp`qvLF?l@nCb@hB\\pAd@vAtA~CXz@Hd@@hAAvBHnBZfBhArDv@hDb@vC@~@KfA[fAg@jAWx@U|AKjACv@?dEEnAI~@c@xEW~BEp@?fAN`HFv@XjBFr@Bh@G`A_@nB]rB[fCSxAMb@Ud@MP`@TTHh@JvANdAHn@@rAEt@Bx@HnBXd@TpDzCfB~AVZN^\\dAXr@^h@j@v@X^f@Oz@]b@Sd@a@t@}AvAaD`@k@`@a@d@WdBu@hAo@\\WX[P[t@yBx@eBrByDb@eArAoDl@{An@_AbA_AjCyA|A{@x@g@p@i@n@o@jAwAnCeDl@o@pCsBjE{C`PgL|QsMzAw@XKp@QbAMnEWv@Ir@QxBsAjDwB`BaAXMd@IrCYfAQ`@Mj@_@t@w@bAoAjGeJlAeBRc@Rw@Ns@LcADq@eBFsA@mAE_AIoASoBe@aTgFeEaAkAIkCAqDCo@GiAYaQ{FqGyB_B_@eK{AyIqA}@G_B@iDXaBLsABuACsBOmAAaAHuCn@gARiBHyCDiAJ}@TgAh@_BjA}ArAeBvAq@d@o@\\m@ToA\\uGfBqJhCw@RYDc@Bo@@G?"
},
"summary" : "Sandy Hollow Rd and CT-117 N",
"warnings" : [
"Walking directions are in beta. Use caution – This route may be missing sidewalks or pedestrian paths."
],
"waypoint_order" : []
}
],
"status" : "OK"
}
有什么办法吗？我尝试使用steps进行操作，但问题是是否有掉头或驶入不同的街道等。这会增加步伐，所以我不知道在B -> C之间有10步或1步。