> For the complete documentation index, see [llms.txt](https://liseen315.gitbook.io/laravel/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://liseen315.gitbook.io/laravel/shou-ji-he-chu-li-yong-hu-shu-ju/zhu-ru-yi-ge-qing-qiu-dui-xiang/usdrequest-greater-than-has.md).

# $request->has()

使用$request->has()，您可以检测特定的用户输入是否对您可用。请查看示例7-4，其中包含之前URL的utm查询字符串参数

{% code title="Example 7-4. $request->has()" %}

```php
// POST route at /post-route
if ($request->has('utm')) { 
    // Do some analytics work
}
```

{% endcode %}