微信官方文档: http://mp.weixin.qq.com/wiki
微信公众平台OAuth2.0授权详细步骤如下：
1. 用户关注微信公众账号。
2. 微信公众账号提供用户请求授权页面URL。
3. 用户点击授权页面URL，将向服务器发起请求
4. 服务器询问用户是否同意授权给微信公众账号(scope为snsapi_base时无此步骤)
5. 用户同意(scope为snsapi_base时无此步骤)
6. 服务器将CODE通过回调传给微信公众账号
7. 微信公众账号获得CODE
8. 微信公众账号通过CODE向服务器请求Access Token
9. 服务器返回Access Token和OpenID给微信公众账号
10. 微信公众账号通过Access Token向服务器请求用户信息(scope为snsapi_base时无此步骤)
11. 服务器将用户信息回送给微信公众账号(scope为snsapi_base时无此步骤)
授权页面:oauth.php(引导用户点入...)
1 <?php 2 require(dirname(__FILE__) . ‘/api.class.php‘); 3 require(dirname(__FILE__) . ‘/wechat.class.php‘); 4 5 //多微信帐号支持 6 $weixinconfig = $db->getRow ( "SELECT * FROM " . $GLOBALS[‘ecs‘]->table(‘weixin_config‘) . " WHERE `id` = 1" ); 7 //多微信帐号支持 8 $id = intval($_GET[‘id‘]);//1 9 $oid = intval($_GET[‘oid‘]);//410 11 if($id > 0){12 $otherconfig = $db->getRow ( "SELECT * FROM " . $GLOBALS[‘ecs‘]->table(‘weixin_config‘) . " WHERE `id` = $id" );13 if($otherconfig){14 $weixinconfig[‘token‘] = $otherconfig[‘token‘];15 $weixinconfig[‘appid‘] = $otherconfig[‘appid‘];16 $weixinconfig[‘appsecret‘] = $otherconfig[‘appsecret‘];17 }18 }19 $weixin = new core_lib_wechat($weixinconfig);20 if($_GET[‘code‘]){21 //echo $_GET[‘code‘];die();22 $json = $weixin->getOauthAccessToken();23 //print_r($json);exit();24 if($json[‘openid‘]){25 26 $wxuser = $GLOBALS[‘db‘]->getRow("select ecuid,unionid,uid,access_token from " . $GLOBALS[‘ecs‘]->table(‘weixin_user‘) . " where fake_id=‘{$json[‘openid‘]}‘");27 //print_r($wxuser);exit();28 //如果用户unionid多平台登录，自动绑定29 if($wxuser[‘unionid‘]==""){30 $wxuserinof = $weixin->getUserInfo($json[‘openid‘]);31 $sql = "update ".$GLOBALS[‘ecs‘]->table(‘weixin_user‘)." set `unionid`=‘".$wxuserinof[‘unionid‘]."‘ where uid=‘".$wxuser[‘uid‘]."‘";32 $GLOBALS[‘db‘]->query($sql);33 }34 $ecuid = $wxuser[‘ecuid‘];35 36 if($ecuid > 0){37 $username = $GLOBALS[‘db‘]->getOne("select user_name from ".$GLOBALS[‘ecs‘]->table(‘users‘)." where user_id=‘{$ecuid}‘");38 $GLOBALS[‘user‘]->set_session($username);39 $GLOBALS[‘user‘]->set_cookie($username,1);40 update_user_info(); //更新用户信息41 recalculate_price(); //重新计算购物车中的商品价格42 }43 }44 45 $url = $api->dir."/mobile/user.php";46 if($oid > 0){47 $url = $db->getOne ( "SELECT weburl FROM " . $GLOBALS[‘ecs‘]->table(‘weixin_oauth‘) . "48 WHERE `oid` = $oid" );49 $db->query("update " . $GLOBALS[‘ecs‘]->table(‘weixin_oauth‘) . "50 set click=click+1 WHERE `oid` = $oid ");51 }52 header("Location:$url");exit;53 }54 $url = $GLOBALS[‘ecs‘]->url()."/oauth.php?id={$id}&oid={$oid}";55 $url = $weixin->getOauthRedirect($url,1,‘snsapi_base‘);56 header("Location:$url");exit;
