I am attempting to use PHP's stream_socket_client() function in a non-blocking (asynchronous) fashion. Documentation on PHP's web site indicates that the STREAM_CLIENT_ASYNC_CONNECT option flag should enable this. However, the following code...

$start_time = microtime(true);
$sockets[$i] = stream_socket_client('ssl://74.125.47.109:993', $errint, $errstr, 1, STREAM_CLIENT_ASYNC_CONNECT);
$end_time = microtime(true);
echo "Total time taken: " . ($end_time-$start_time) . " secs.";

Outputs the following:

Total time taken: 0.76204109191895 secs.

Evidently, the function is blocking (also supported by the fact that omission of the STREAM_CLIENT_ASYC_CONNECT flag does not meaningfully change the "total time taken" script output.

Any ideas on why this may be happening, and how to enforce a non-blocking connection attempt?

php sockets ssl
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