filter_has_var 存在指定变量
最后更新于：2022-04-02 02:27:47
[TOC]
## 实例
```
// 只有通过 url 才能查询
// http://localhost/nanhe/test.php?email=1 //Email Found
// http://localhost/nanhe/test.php?email //Email Found
// http://localhost/nanhe/test.php //Email Not Found
var_dump(filter_has_var(INPUT_GET, 'test')); //true;
// 添加则无效
$_GET['test'] = 1;
var_dump(filter_has_var(INPUT_GET, 'test')); //false;
```
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