APP/小程序-微信授权解绑时，删除unionid绑定关系

app/controller/api/user/User.php

@@ -2671,7 +2671,15 @@ class User extends BaseController
                 $data = ["wechat_user_id" => $openid];
                 $unionId = $openid;
                 $existUid = Db::name('user_extract_openid')->where('openid',$unionId)->value('uid');
-                if (!empty($existUid) && $existUid != $uid) throw new \Exception("此微信号已被绑定");
+                if (!empty($existUid) && $existUid != $uid) {
+                    $existUserData = Db::name("user")->where("uid", $existUid)->find();
+                    if ($existUserData['is_del'] != 1) {
+                        throw new \Exception("此微信号已被绑定");
+                    } else {
+                        Db::name('user_extract_openid')->where('openid',$unionId)->delete();
+                        Db::name("user")->where(['uid' => $existUid])->update(["wechat_user_id" => 0]);
+                    }
+                }
                 $check = Db::name('user_extract_openid')->where('uid',$uid)->value('openid');
                 if (!empty($check)){
                     if ($check != $unionId) throw new \Exception("当前用户已绑定其他微信号");