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这个Undefined offset: 1 报错是怎么回事。谢谢！

### 鲁飞大神，麻烦你帮我看看这个Undefined offset: 1 报错怎么回事

### 相关代码
```php
$o = 10;
        $n = (int)$event['name'];
        if ($n == 10 || $n == 20 || $n == 30 || $n == 40 || $n == 50 || $n == 60 || $n == 70 || $n == 80 || $n == 90) {
            $t = ($n + $o);
            var_dump($t);
            $model = Db::table('devices')->where('device_name', ($t))->field('device_model')->find();
            var_dump($model);
            $event['name']=$model;
            $fds = Db::table('devices')->where('device_model', $event['name'])->field('device_fd')->select()->toArray();
            if (count($fds) > 0) {
                $to = array();
                for ($x = 0; $x < count($fds); $x++) {
                    array_push($to, $fds[$x]['device_fd']);
                }
                $ws->to($to)->emit('pi_callback', $event['msg']);
                $ws->emit('pi_callback', $event['msg']);
            } else {
                //进行更新操作
                Db::table('devices')->where('device_name', ($n))->update(['device_task' => $event['task'],]);
                //发送消息到主控端让主控端刷新
                $device = Db::table('devices')->where('device_name', 'admin')->find();
                if ($device['device_status'] == 1) {
                    $ws->to($device['device_fd'])->emit('add_callback', '刷新页面');
                }
            }
        }
    }
}
```

###这里报错了 [think\exception\ErrorException]  
```php
  Undefined offset: 1

Exception trace:
 () at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/Builder.php:493
 think\initializer\Error->appError() at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/Builder.php:493
 think\db\Builder->parseWhereItem() at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/Builder.php:386
 think\db\Builder->parseWhereLogic() at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/Builder.php:331
 think\db\Builder->buildWhere() at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/Builder.php:299
 think\db\Builder->parseWhere() at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/builder/Mysql.php:94
 think\db\builder\Mysql->select() at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/PDOConnection.php:916
 think\db\PDOConnection->think\db\{closure}() at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/PDOConnection.php:699
 think\db\PDOConnection->pdoQuery() at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/PDOConnection.php:917
 think\db\PDOConnection->select() at /www/wwwroot/tp/vendor/topthink/think-orm/src/db/BaseQuery.php:1090
 think\db\BaseQuery->select() at /www/wwwroot/tp/app/listener/WsTest.php:56
 app\listener\WsTest->handle() at n/a:n/a
 ReflectionMethod->invokeArgs() at /www/wwwroot/tp/vendor/topthink/framework/src/think/Container.php:328
 think\Container->invokeMethod() at /www/wwwroot/tp/vendor/topthink/framework/src/think/Container.php:361
 think\Container->invoke() at /www/wwwroot/tp/vendor/topthink/framework/src/think/Event.php:260
 think\Event->dispatch() at /www/wwwroot/tp/vendor/topthink/framework/src/think/Event.php:221
 think\Event->trigger() at /www/wwwroot/tp/vendor/topthink/think-swoole/src/concerns/InteractsWithWebsocket.php:91
 think\swoole\Manager->think\swoole\concerns\{closure}() at /www/wwwroot/tp/vendor/topthink/framework/src/think/Container.php:293
 think\Container->invokeFunction() at /www/wwwroot/tp/vendor/topthink/framework/src/think/Container.php:357
 think\Container->invoke() at /www/wwwroot/tp/vendor/topthink/think-swoole/src/Sandbox.php:84
 think\swoole\Sandbox->run() at /www/wwwroot/tp/vendor/topthink/think-swoole/src/concerns/WithApplication.php:112
 think\swoole\Manager->runInSandbox() at /www/wwwroot/tp/vendor/topthink/think-swoole/src/concerns/InteractsWithWebsocket.php:94
```

发布于5年前 · 13 次浏览 · 来自提问

菜鸟V0

### 鲁飞大神，麻烦你帮我看看这个Undefined offset: 1 报错怎么回事

###这里报错了 [think\exception\ErrorException]  
```php
  Undefined offset: 1

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2021-07-01

鲁飞