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  1、配置授权回调页面域名,如 www.aaa.com 
  2、模拟公众号的第三方网页,fn_system.php 
 
<?php 
if(empty($_SESSION['user'])){ 
header("Location:http://www.aaa.com/uc/fn_wx_login.php"); 
}else{ 
print_r($_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。 
  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。 
  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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