input / output
最后更新于：2022-04-02 02:31:33
[TOC]
## php://input
## php://output
### 实例1
```
$fp = fopen('php://output', 'w');
fwrite($fp, "This is a test.\n");
// 等价于
echo "This is a test.\n";
```
### 使用 流处理对输出内容进行过滤
```
$fp = fopen('php://output', 'w');
// 对流进行过滤
stream_filter_append($fp, 'string.toupper');
fwrite($fp, "This is a test.\n"); // THIS IS A TEST.
```
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