redirect_uni参数错误

相关代码：
public function getOauthUserInfoUrl($callback, $state = '') {

return "https://open.weixin.qq.com/connect/oauth2/authorize?appid={$this->account['key']}&redirect_uri={$callback}&response_type=code&scope=snsapi_userinfo&state={$state}#wechat_redirect";

}

$url = (!empty($unisetting['oauth']['host']) ? ($unisetting['oauth']['host'] . '/') : $_W['siteroot']) . "app/index.php?i={$_W['uniacid']}{$str}&c=auth&a=oauth&scope=userinfo";

$callback = urlencode($url);

$oauth_account = WeAccount::create($_W['account']['oauth']);

$forward = $oauth_account->getOauthUserInfoUrl($callback, $state);

header('Location: ' . $forward);

exit;

一般来说出现这种情况，检查下公众平台里面设置的域名和$callback里面的域名是否符合。然后再检查一下appid是不是正确的