Stream Filters
最后更新于：2022-04-02 02:32:02
[TOC]
## 接口
```
stream_filter_prepend 将过滤器附加到流
stream_filter_append 将过滤器附加到流
stream_filter_remove 移除过滤器
stream_get_filters 获取已注册的数据流过滤器列表
stream_filter_register 注册过滤器
```
## 实例
### 新增一个过滤器
```
class str_test extends php_user_filter
{
public function filter($in, $out, &$consumed, $closing)
{
while($bucket = stream_bucket_make_writeable($in)){
$bucket->data = strtoupper($bucket->data);
$consumed += $bucket->datalen;
stream_bucket_append($out, $bucket);
}
return PSFS_PASS_ON;
}
}
$fp = fopen("php://output","wb");
stream_filter_register("str_test","str_test");
stream_filter_append($fp,"str_test");
fwrite($fp,"abc"); // ABC
```
### 获取注册的过滤器
```
print_r(stream_get_filters());
//Array
//(
// [0] => convert.iconv.*
// [1] => mcrypt.*
// [2] => mdecrypt.*
// [3] => string.rot13
// [4] => string.toupper
// [5] => string.tolower
// [6] => string.strip_tags
// [7] => convert.*
// [8] => consumed
// [9] => dechunk
// [10] => zlib.*
// [11] => str_test
//)
//
```
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