(PHP 7 >= 7.0.7)
socket_export_stream — Export a socket extension resource into a stream that encapsulates a socket
socket_export_stream ( resource $socket ) : resource|false
This function is currently not documented; only its argument list is available.
socket
 Return resource or false on failure. 
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    https://www.php.net/manual/en/function.socket-export-stream.php