WeChat public platform Message Interface development geographic location query nearby merchant instances

This article describes in detail the development of the message interface on the public platform and the query of information about nearby merchant instances. For more information, see 1. get the user address location message

The message format when the user sends the location is as follows:

Background format:

 
  gh_680bdefc8c5d
  
  oIDrpjqASyTPnxRmpS9O_ruZGsfk
   
    
1359036619
   
   location
   
   
    
22.539968
   
   
    
113.954980
   
   
    
16
   
   中国广东省深圳市南山区华侨城深南大道9789号 邮政编码: 518057
   
    
5837017832671832047
   
  
 

XML Format Description

ToUserName: message recipient number. generally, it is the public platform account number FromUserName. the message sender number is CreateTime. the Message creation time is MsgType, geographic location: location Location_X geographic location latitude Location_Y geographic location longitude Scale map scaling size Label Geographic location information MsgId message ID

2. obtain information about the surrounding area

Baidu Map Place API is a simple HTTP interface used to return and query certain types of POI data in a region, and provides a single POI details query service, you can use C #, C ++, Java, and other development languages to send HTTP requests and receive json and xml data.

The Place API provides regional search POI service, POI details Service and group buying information retrieval service, and merchant group buying details query. The regional search POI service provides three regional search methods: intra-city search, rectangular search, and circular area search.

We use circular area search to implement nearby search.

The service interface for searching POI in the place region is as follows:

Http://api.map.baidu.com/place/v2/search

Parameters	Required?	Default value	Format example	Description
Location	Yes	None	38.76623, 116.43213 Lat <纬度> , Lng <经度>	Peripheral retrieval center. Multiple points are not supported.
Radius (r)	No	None	2000	Peripheral search radius, in meters
Q (query)	Yes	None	Zhongguancun, ATM, Baidu Tower	Search keywords. The search in the surrounding area and the search in the rectangle area support multiple keywords in parallel. different keywords are separated by the $ symbol, and a maximum of 10 keywords can be searched. For example, "Bank $ Hotel ".
Tag	No	None	Japanese barbecue/teppanyaki, Chaowai Street	Tag item, which can be searched in combination with q
Output	No	Xml	Json or xml	The output format is json or xml.
Scope	Yes	1	1, 2	The details of the search results. If the value is 1 or null, basic information is returned. if the value is 2, POI details are returned.
Filter	No	None	Filter = industry_type: cater | Sort_name: price | Sort_rule: 0 | Price_section: 100,200 | Groupon: 0 | Discount: 0	Search for filtering conditions. when the scope value is 2, you can set filter to sort. Industry_type: Industry Type Sort_name: sorting field Sort_rule: sorting rule. values: 0: from high to low; 1: from low to high; Price_section: price range; Groupon: whether there are group purchases. 1 is group purchases, and 0 is group purchases; Discount: indicates whether a discount is made. 1 indicates a discount, and 0 indicates no discount;
Page_size	No	10	10	Number of records in the range. the default value is 10, and a maximum of 20 records are returned. When multiple keywords are retrieved, the number of records returned is the number of keywords * page_size.
Page_num	No	0	0, 1, 2	Page number. the default value is 0, 0, which indicates the first page, 1 indicates the second page, and so on.
Ak	Yes	None	E4805d16520de693a3fe707gj962045	The user's access key, required. This attribute is key before v2.
Sn	No	None		The user's permission signature.
Timestamp	No	None		This value is required after sn is set.

Call example:

http://api.map.baidu.com/place/v2/search?ak=MgBALVVeCd8THVBi6gPdvsvG&output=json&query=%E9%93%B6%E8%A1%8C&page_size=5&page_num=0&scope=2&location=39.915,116.404&radius=2000&filter=sort_name:distance

3. program implementation

Baidu Map class is defined as follows

Class baiduMapClient {private $ api_server_url; private $ auth_params; public function _ construct () {$ this-> api_server_url =" http://api.map.baidu.com/ "; $ This-> auth_params = array (); $ this-> auth_params ['key'] =" 401f9a693dd267dd9a4661ec0895fb20 "; $ this-> auth_params ['output'] = "json";} public function Geocoding_coordinate_address ($ location) {return $ this-> call ("geocoder ", array ("location" => $ location ));}// http://api.map.baidu.com/ Place/search? & Query = glasses & location = 39.915, 116.404 & radius = 3000 & output = json & key = 37109c0ee6f924cb5e934fa08c6b1676 public function Place_search ($ query, $ location, $ radius) {return $ this-> call ("place/search", array ("query" => $ query, "location" => $ location, "radius" => $ radius);} protected function call ($ method, $ params = array () {$ headers = array ("User-Agent: mozilla/5.0 (Windows NT 5.1; rv: 14.0) Gecko/20100101 Firefox/14.0.1 "," Accept: text/html, application/xhtml + xml, application/xml; q = 0.9, */*; q = 0.8 "," Accept-Language: en-us, en; q = 0.5 ", //" Accept-Encoding: gzip, deflate "," Referer: http://developer.baidu.com/ "); $ Params = array_merge ($ this-> auth_params, $ params); $ url = $ this-> api_server_url." $ method? ". Http_build_query ($ params); if (DEBUG_MODE) {echo "REQUEST: $ url ". "\ n" ;}$ ch = curl_init (); curl_setopt ($ ch, CURLOPT_URL, $ url); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, true ); // curl_setopt ($ ch, CURLOPT_HTTPHEADER, $ headers); $ data = curl_exec ($ ch); curl_close ($ ch); $ result = null; if (! Empty ($ data) {if (DEBUG_MODE) {echo "RETURN :". $ data. "\ n" ;}$ result = json_decode ($ data);} else {echo "cURL Error :". curl_error ($ ch);} return $ result ;}}

Obtain the nearby call code as follows:

Function catchEntitiesFromLocation ($ entity, $ x, $ y, $ radius) {$ mapObj = new baiduMapClient (); $ search = $ mapObj-> Place_search ($ entity, $ x. ",". $ y, $ radius); $ results = $ search-> results; for ($ I = 0; $ I <count ($ results); $ I ++) {$ distance = getDistance ($ x, $ y, $ results [$ I]-> location-> lat, $ results [$ I]-> location-> lng ); $ shopSortArrays [$ distance] = array ("Title" => "【". $ results [$ I]-> name. "] <". $ distance. "M>". $ results [$ I]-> address. (isset ($ results [$ I]-> telephone )? "". $ Results [$ I]-> telephone: ""), "Description" => "", "PicUrl" => "", "Url" => "");} ksort ($ shopSortArrays); // Sort $ shopArray = array (); foreach ($ shopSortArrays as $ key => $ value) {$ shopArray [] = array ("title" => $ value ["Title"], "description" => $ value ["Description"], "pic" => $ value ["PicUrl"], "url" => $ value ["Url"],); if (count ($ shopArray)> 6) {break ;}return $ shopArray ;}

The distance between two coordinates is calculated as follows:

Function getDistance ($ lat_a, $ lng_a, $ lat_ B, $ lng_ B) {// R is the Earth's radius (meters) $ R = 6366000; $ pk = doubleval (180/3 .14169 ); $ a1 = doubleval ($ lat_a/$ pk); $ a2 = doubleval ($ lng_a/$ pk); $ b1 = doubleval ($ lat_ B/$ pk ); $ b2 = doubleval ($ lng_ B/$ pk); $ t1 = doubleval (cos ($ a1) * cos ($ a2) * cos ($ b1) * cos ($ b2); $ t2 = doubleval (cos ($ a1) * sin ($ a2) * cos ($ b1) * sin ($ b2 )); $ t3 = doubleval (sin ($ a1) * sin ($ b1); $ tt = doubleval (acos ($ t1 + $ t2 + $ t3 )); return round ($ R * $ tt );}

We use databases to store user coordinate records,

If you send a query command, you can directly query,

Function searchUserLocation ($ userWxid) {Global $ mysql_host; Global $ mysql_host_s; Global $ mysql_port; Global $ mysql_user; Global $ mysql_password; Global $ mysql_database; // query slave database, support SAE $ mysql_table = "location"; $ mysql_state = "SELECT * FROM ". $ mysql_table. "WHERE userWxid = \"". $ userWxid. "\" "; $ con = mysql_connect ($ mysql_host. ':'. $ mysql_port, $ mysql_user, $ mysql_password); if (! $ Con) {die ('could not connect :'. mysql_error ();} mysql_query ("set names 'utf8'"); mysql_select_db ($ mysql_database, $ con); $ result = mysql_query ($ mysql_state ); $ location = array (); while ($ row = mysql_fetch_array ($ result) {$ location ["x"] = $ row ["locationX"]; $ location ["y"] = $ row ["locationY"];} mysql_close ($ con); if (isset ($ location ["x"]) & $ location ["x"]! = 0.0) {return $ location;} else {return "the system does not contain your geographic location information. please send the location to me first! You don't have to worry about your whereabouts being leaked because you can slide the map and send the addresses elsewhere. ";}}

If the user sends the location, update it.

Function updateOrInsert ($ weixinid, $ locationX, $ locationY) {if (isset ($ _ SERVER ['http _ appname']) {$ mysql_host = SAE_MYSQL_HOST_M; $ mysql_host_s = bytes; // sae slave database $ mysql_port = SAE_MYSQL_PORT; $ mysql_user = SAE_MYSQL_USER; $ mysql_password = SAE_MYSQL_PASS; $ mysql_database = slave;} else {$ mysql_host = "127.0.0.1 "; $ mysql_host_s = "127.0.0.1"; $ mysql_port = "3306"; $ mysql_user = "ro Ot "; $ mysql_password =" root "; $ mysql_database =" sae ";}$ mysql_table =" location "; // insert into location VALUES (" 23s2s ", 1122.2, 366.2) on duplicate key update locationX = 1122.2, locationY = 366.2; $ mysql_state = "insert ". $ mysql_table. "VALUES (\"". $ weixinid. "\",". $ locationX. ",". $ locationY. ") on duplicate key update locationX = ". $ locationX. ", locationY = ". $ locationY. ";"; var_dump ($ mys Ql_state); // $ con = mysql_connect ($ mysql_host. ':'. $ mysql_port, $ mysql_user, $ mysql_password); if (! $ Con) {die ('could not connect :'. mysql_error ();} mysql_query ("set names 'utf8'"); mysql_select_db ($ mysql_database, $ con); $ result = mysql_query ($ mysql_state ); if ($ result = true) {// return "the submitted position is latitude :". $ locationX. ", Longitude :". $ locationY. ". \ N can now send "nearby" and keyword commands to query nearby targets, such as "nearby hotels" and "nearby hospitals ". "; Return" your location has been obtained successfully. You don't have to worry about your whereabouts being leaked, because you can submit the address thousands of miles away. \ N can now send "nearby" and keyword commands to query nearby targets, such as "nearby hotels" and "nearby hospitals ". ";} Else {return" failed to submit. please try again. If this error persists, please leave a message. ";}}

For the content sent by the user, extract the coordinates and perform combined query.

The preceding figure shows the details of nearby merchant instances in the development of the message interface on the public platform. For more information, see other related articles on php Chinese network!