1、配置授权回调页面域名，如 www.aaa.com
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2、模拟公众号的第三方网页，fn_system.php
<?phpif(empty($_SESSION['user'])){ header("Location:http://www.aaa.net/uc/fn_wx_login.php");}else{ print_r($_SESSION['user']);}?>?
3、访问第三方网页时，如果检查session中不存在会话信息，则跳转至登陆页，fn_wx_login.php
<?php $appid = "公众号在微信的appid"; $url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid='.$appid.'&redirect_uri=http%3a%2f%2fwww.aaa.com%2fuc%2ffn_callback.php&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect'; header("Location:".$url);?>?
4、在登陆页组装appid，回跳url等信息，然后跳转至微信的用户授权页。
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5、在微信的用户授权页，如果用户选择了“同意授权”，则微信重新回跳至第三方网页的回跳地址时，会附带上code参数。
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6、第三方网页的回跳url中，首先从请求中取得code，然后根据code进一步换取openid和access_token，然后就可以根据openid和access_token调用微信的相关接口查询用户信息了。
<?php$appid = "公众号在微信的appid";$secret = "公众号在微信的app secret";$code = $_GET["code"];$get_token_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$appid.'&secret='.$secret.'&code='.$code.'&grant_type=authorization_code';$ch = curl_init();curl_setopt($ch,CURLOPT_URL,$get_token_url);curl_setopt($ch,CURLOPT_HEADER,0);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);$res = curl_exec($ch);curl_close($ch);$json_obj = json_decode($res,true);//根据openid和access_token查询用户信息$access_token = $json_obj['access_token'];$openid = $json_obj['openid'];$get_user_info_url = 'https://api.weixin.qq.com/sns/userinfo?access_token='.$access_token.'&openid='.$openid.'&lang=zh_CN';$ch = curl_init();curl_setopt($ch,CURLOPT_URL,$get_user_info_url);curl_setopt($ch,CURLOPT_HEADER,0);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);$res = curl_exec($ch);curl_close($ch);//解析json$user_obj = json_decode($res,true);$_SESSION['user'] = $user_obj;print_r($user_obj);?>
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