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POUsing zlib filter with a socket pair
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  1. POUsing zlib filter with a socket pair
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    copied!<p>For some reason, the <code>zlib.deflate</code> filter doesn't seem to be working with socket pairs generated by <code>stream_socket_pair()</code>. All that can be read from the second socket is the two-byte zlib header, and everything after that is NULL.</p> <p>Example:</p> <pre><code>&lt;?php list($in, $out) = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP); $params = array('level' =&gt; 6, 'window' =&gt; 15, 'memory' =&gt; 9); stream_filter_append($in, 'zlib.deflate', STREAM_FILTER_WRITE, $params); stream_set_blocking($in, 0); stream_set_blocking($out, 0); fwrite($in, 'Some big long string.'); $compressed = fread($out, 1024); var_dump($compressed); fwrite($in, 'Some big long string, take two.'); $compressed = fread($out, 1024); var_dump($compressed); fwrite($in, 'Some big long string - third time is the charm?'); $compressed = fread($out, 1024); var_dump($compressed); </code></pre> <p>Output:</p> <pre><code>string(2) "x�" string(0) "" string(0) "" </code></pre> <p>If I comment out the call to <code>stream_filter_append()</code>, the stream writing/reading functions correctly, with the data being dumped in its entirety all three times, and if I direct the zlib filtered stream into a file instead of through the socket pair, the compressed data is written correctly. So both parts function correctly separately, but not together. Is this a PHP bug that I should report, or an error on my part?</p> <p><em>This question is branched from a solution to <a href="https://stackoverflow.com/questions/7207484/how-do-i-use-phps-stream-select-with-a-zlib-filter">this related question</a>.</em></p>
 

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