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    <p>The answer would be to use instead <code>stream_socket_client</code> with the flag <code>STREAM_CLIENT_ASYNC_CONNECT</code>; however there seems to be some bug with SSL:</p> <pre><code>&lt;?php $socket = stream_socket_client( 'ssl://197.136.197.92:443', $errno, $errstr, 3, // timeout should be ignored when ASYNC STREAM_CLIENT_ASYNC_CONNECT ); if (!$socket) { echo "errno = ".$errno."\nerrstr = ".$errstr."\n"; exit; } </code></pre> <p>On Linux there seems to be an infinite loop with:</p> <pre><code>write(3, "\26\3\1\0o\1\0\0k\3\1L\325w/\337u\343uV\341\365}H\331\21k\313\341Q\f\356\""..., 116) = -1 EAGAIN (Resource temporarily unavailable) </code></pre> <p>On some BSD variant on <a href="http://codepad.viper-7.com/" rel="nofollow">http://codepad.viper-7.com/</a> :</p> <pre><code>&lt;br /&gt; &lt;b&gt;Warning&lt;/b&gt;: stream_socket_client() [&lt;a href='function.stream-socket-client'&gt;function.stream-socket-client&lt;/a&gt;]: SSL: connection timeout in &lt;b&gt;/tmp/cpQ8Gv7B&lt;/b&gt; on line &lt;b&gt;9&lt;/b&gt;&lt;br /&gt; &lt;br /&gt; &lt;b&gt;Warning&lt;/b&gt;: stream_socket_client() [&lt;a href='function.stream-socket-client'&gt;function.stream-socket-client&lt;/a&gt;]: Failed to enable crypto in &lt;b&gt;/tmp/cpQ8Gv7B&lt;/b&gt; on line &lt;b&gt;9&lt;/b&gt;&lt;br /&gt; &lt;br /&gt; &lt;b&gt;Warning&lt;/b&gt;: stream_socket_client() [&lt;a href='function.stream-socket-client'&gt;function.stream-socket-client&lt;/a&gt;]: unable to connect to ssl://197.136.197.92:443 (Unknown error) in &lt;b&gt;/tmp/cpQ8Gv7B&lt;/b&gt; on line &lt;b&gt;9&lt;/b&gt;&lt;br /&gt; errno = 115 errstr = </code></pre> <p>See also <a href="http://bugs.php.net/bug.php?id=49295" rel="nofollow">bug #49295</a>.</p>
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    1. CO`stream_socket_client` worked great, thanks. One issue is the inability to detect timeouts on async connections. I have posted my workaround here: http://stackoverflow.com/questions/3333398/php-get-socket-error-string-when-async-connect-fails/4114499#4114499
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    2. CO@Craig Which version are you using? There may have been a bug introduced here recently, because I'm experiencing the problems I've described.
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    3. CO5.3.3 on Ubuntu. I'm not seeing any warnings in SSL mode.
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