第一步点击这个链接获取code 

<h3><span>其他登录方式</span></h3>     

<a class="ico_wx" href="https://open.weixin.qq.com/connect/oauth2/authorize?appid={$cfg_weixi_appkey}&redirect_uri={$main_host}/pub/thirdlogin/?type=wechat&response_type=code&scope=snsapi_userinfo&state={$code}#wechat_redirect"><em></em><span>微信</span></a>

地址例子:

https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxcbee7e85e159396c&redirect_uri=http://txy.handongkeji.com/pub/thirdlogin/?type=wechat&response_type=code&scope=snsapi_userinfo&state=&connect_redirect=1#wechat_redirect

第二部链接点击后会自动传递code值,跳转到这个方法中去

public function action_thirdlogin()
{

  $code = $_GET['code'];
  $appid = $GLOBALS['cfg_weixi_appkey'];
  $appsecret = $GLOBALS['cfg_weixi_appsecret'];
  if ($code) {
    $rs = Common::wechat_login($appid, $appsecret, $code);
  }

  if ($rs['openid']) {}

}

第三部执行这个方法获取微信用户的个人信息

/**
*
* 微信授权
*/
public static function wechat_login($appid, $appsecret, $code)
{
$token_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' . $appid . '&secret=' . $appsecret . '&code=' . $code . '&grant_type=authorization_code';

$token = json_decode(file_get_contents($token_url));
//var_dump($token);die;
if (isset($token->errcode)) {
return false;
}
$access_token_url = 'https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=' . $appid . '&grant_type=refresh_token&refresh_token=' . $token->refresh_token;
//转成对象
$access_token = json_decode(file_get_contents($access_token_url));
if (isset($access_token->errcode)) {
return false;
}
$user_info_url = 'https://api.weixin.qq.com/sns/userinfo?access_token=' . $access_token->access_token . '&openid=' . $access_token->openid . '&lang=zh_CN';
//转成对象
$user_info = json_decode(file_get_contents($user_info_url));
if (isset($user_info->errcode)) {
return false;
}
//var_dump($user_info);die;
$result = json_decode(json_encode($user_info), true);//返回的json数组转换成array数组
//var_dump($result);die;
return $result;//这里就会获取到微信登录用户的个人信息都包含在里面
}