如何将PHP的stream_select（）与zlib过滤器一起使用？ [英] How do I use PHP's stream_select() with a zlib filter?

问题描述

我现在有一个用PHP编写的服务器守护进程，它使用 stream_socket _ * 函数接受传入连接并为它们创建网络流，并使用 stream_select（）。我希望能够添加一个zlib过滤器（使用 string_filter_append（））到一个任意的流，但是当我这样做，我得到一个错误告诉我， stream_select（）不能用于查询过滤的流。

如何解决这个限制？您可以使用一个管道，并将过滤器添加到管道中。

解决方案

从select（）函数中读取原始数据流，把它写到管道，并读取解码的数据在另一边：）

  list（$ in，$ out ）= stream_socket_pair（STREAM_PF_UNIX，STREAM_SOCK_STREAM，0）; 
 
 stream_filter_append（$ out，'zlib.inflate'，STREAM_FILTER_READ）; 
 stream_set_blocking（$ out，0）; 
 
 while（stream_select（...））{
 //假设$ stream是非阻塞的
 stream_copy_to_stream（$ stream，$ in）; 
 
 $ decoded_data = stream_get_contents（$ out）; 
 
 $ / code $ / pre 
 $ b $ p用php：// memory stream也可以达到同样的效果。 / p> 
I currently have a server daemon written in PHP which accepts incoming connections and creates network streams for them using the stream_socket_* functions and polls active streams using stream_select().  I'd like to be able to add a zlib filter (using string_filter_append()) to an arbitrary stream, but when I do, I get an error telling me that stream_select() can't be used to poll a filtered stream.

How can I get around this limitation?
解决方案
You can use a pipe, and add the filter to the pipe instead.

This will allow you to use stream_select on the stream, and the pipe will serve as a buffer for zlib.

Read the raw data from the select()ed stream, write it to the pipe, and read the decoded data on the other side :)
list($in, $out) = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, 0);

stream_filter_append($out, 'zlib.inflate', STREAM_FILTER_READ);
stream_set_blocking($out, 0);

while (stream_select(...)) {
    // assuming that $stream is non blocking
    stream_copy_to_stream($stream, $in);

    $decoded_data = stream_get_contents($out);
}
The same can probably be achieved with a php://memory stream.

                        
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