WeChat public platform development automatically updates WeChat accesstoken

Access_token is the globally unique ticket of the public account. access_token is required when the public account calls each interface. Under normal circumstances, the validity period of the access_token is 7200 seconds. repeated access_token acquisition will invalidate the previous access_token. This topic describes how to store and update access tokens.

1. Access Token

Access_token is the globally unique ticket of the public account. access_token is required when the public account calls each interface. Under normal circumstancesAccess_token is valid for 7200 seconds, Duplicate access will invalidate the last access_token.

The public account can use AppID and AppSecret to call this interface to obtain the access_token. AppID and AppSecret can be obtained in the development mode (you need to become a developer and the account is not abnormal ).Note that https is required to call all interfaces.

API call request description

Http request method: GEThttps: // api.weixin.qq.com/cgi-bin/token? Grant_type = client_credential & appid = APPID & secret = APPSECRET

Parameter description

Parameters	Required?	Description
Grant_type	Yes	Obtain access_token and enter client_credential
Appid	Yes	Unique third-party user credential
Secret	Yes	The unique credential key of a third-party user, which is appsecret

Return description

Normally, the following JSON data packet is returned to the public account:

{"access_token":"ACCESS_TOKEN","expires_in":7200}

III. implementation

Class class_weixin {var $ appid = APPID; var $ appsecret = APPSECRET; // Constructor to obtain Access Token public function _ construct ($ appid = NULL, $ appsecret = NULL) {if ($ appid & $ appsecret) {$ this-> appid = $ appid; $ this-> appsecret = $ appsecret;} // 1. database format/* drop table if exists 'wx _ token'; create table if not exists 'wx _ token' ('id' int (1) not null, 'type' varchar (20) not null, 'expire 'varchar (16) not null, 'value' varchar (600) not null, primary key ('id ')) ENGINE = MyISAM default charset = utf8; insert into 'wx _ token' ('id', 'type', 'expire ', 'value') VALUES (1, 'access _ token', '000000', 't3oyw9frnowkqhqhzxoeh-pgThhjmnCqTVpaLyUD '), (2, 'jsapi _ ticket ','',''); */$ con = mysql_connect (MYSQLHOST. ':'. MYSQLPORT, MYSQLUSER, MYSQLPASSWORD); mysql_select_db (MYSQLDATABASE, $ con ); $ result = mysql_query ("SELECT * FROM 'wx _ token' WHERE 'type' = 'Access _ token'"); while ($ row = mysql_fetch_array ($ result )) {$ this-> access_token = $ row ['value']; $ this-> expires_time = $ row ['expire ']; break;} if (time ()> ($ this-> expires_time + 3600) {$ url =" https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid= ". $ This-> appid. "& secret = ". $ this-> appsecret; $ res = $ this-> http_request ($ url); $ result = json_decode ($ res, true ); $ this-> access_token = $ result ["access_token"]; $ this-> expires_time = time (); mysql_query ("UPDATE 'wx _ token' SET 'expire '=' $ this-> expires_time ', 'value' = '$ this-> access_token 'Where 'type' = 'Access _ token'; ");} // 2. cache format if (isset ($ _ SERVER ['http _ appname']) {// in the SAE environment, activate memcache $ mem = Memcache_init ();} else {// local environment. you must have installed memcache $ mem = new Memcache; $ mem-> connect ('localhost', 11211) or die ("cocould not connect");} $ this-> access_token = $ mem-> get ($ this-> appid); if (! Isset ($ this-> access_token) | empty ($ this-> access_token) {$ url =" https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid= ". $ This-> appid. "& secret = ". $ this-> appsecret; $ res = $ this-> http_request ($ url); $ result = json_decode ($ res, true ); $ this-> access_token = $ result ["access_token"]; $ mem-> set ($ this-> appid, $ this-> access_token, 0, 3600 );} // 3. locally write $ res = file_get_contents ('Access _ token. json '); $ result = json_decode ($ res, true); $ this-> expires_time = $ result ["expires_time"]; $ this-> access_token = $ result ["access_token"]; if (time ()> ($ this-> expires_time + 3600) {$ url =" https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid= ". $ This-> appid. "& secret = ". $ this-> appsecret; $ res = $ this-> http_request ($ url); $ result = json_decode ($ res, true ); $ this-> access_token = $ result ["access_token"]; $ this-> expires_time = time (); file_put_contents ('Access _ token. json ',' {"access_token ":"'. $ this-> access_token. '"," expires_time ":'. $ this-> expires_time. '}');} // 4. real-time pulling $ url =" https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid= ". $ This-> appid. "& secret = ". $ this-> appsecret; $ res = $ this-> http_request ($ url); $ result = json_decode ($ res, true ); $ this-> access_token = $ result ["access_token"]; $ this-> expires_time = time ();}

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