# 输入流 php\://input

## $\_POST 与 php\://input

1. 仅在取值为`application/x-www-data-urlencoded`和`multipart/form-data`时(文件上传时)，php会将http请求body相应数据会填入到数组$\_POST，填入到$\_POST数组中的数据是进行urldecode()解析的结果。
2. 只要Content-Type不为`multipart/form-data`， `php://input`会填入post数据。
3. 仅当Content-Type为`application/x-www-form-urlencoded`且提交方法是POST方法时，$\_POST数据与`php://input`数据才是一致的。

## $HTTP\_RAW\_POST\_DATA 与 php\://input

`php://input`可以读取没有处理过的POST数据。相较于$HTTP\_RAW\_POST\_DATA而言，它给内存带来的压力较小。

$HTTP\_RAW\_POST\_DATA（This feature has been DEPRECATED as of PHP 5.6.0. 被废弃了，查看[官方文档](https://secure.php.net/manual/zh/reserved.variables.httprawpostdata.php)）

更多php\://input，查看[官方文档](https://secure.php.net/manual/zh/wrappers.php.php#wrappers.php.input)

> 解析
>
> ```php
> var_dump($_POST);
> echo file_get_contents("php://input");
> ```
>
> 情况1: 文件上传时,form的`enctype="multipart/form-data",`此时,数据`php://input`获取不到数据
>
> ```php
> <form enctype="multipart/form-data" method="post">
> <input type="text" name="name" />
> <input type="file" name="csv_file" />
> <button type="submit" name="submit" value="Submit">Submit</button>
> </form>
> <?php
> var_dump($_POST);
> echo "<br>";
> var_dump(file_get_contents("php://input"));
> ```
>
> 测试结果 只有`$_POST`获取了数据
>
> array (size=2)
>
> 'name' => string 'test' (length=4)
>
> 'submit' => string 'Submit' (length=6)
>
> 情况2: 非文件上传时的form表单
>
> ```php
> <form method="post">
> name:<input type="text" name="name" /><br>
> age:<input type="text" name="age" />
> <button type="submit" name="submit" value="Submit">Submit</button>
> </form>
> <?php
> echo '$_POST result:<br>';
> var_dump($_POST);
> echo "<br>";
> echo 'php://input result:<br>';
> var_dump(file_get_contents("php://input"));
> ```
>
> 测试结果:两者都会获取数据
>
> ```php
> $_POST result:
> array (size=3)
>   'name' => string 'revin' (length=5)
>   'age' => string '28' (length=2)
>   'submit' => string 'Submit' (length=6)
>
> php://input result:
> string 'name=revin&age=28&submit=Submit' (length=31)
> ```
>
> 情况3 :postman 直接发送json body 体, 也就是api的场景
>
> ![](/files/-LfnTK0Aojwq9hCvM9wx)
>
> 测试结果:只有`php://input`获取到了数据&#x20;


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