cli模式的stream_socket_accept函数有关问题

/* Open a server socket to port 1234 on localhost */<br />
$server = stream_socket_server('tcp://127.0.0.1:12345');<br />
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$socket = stream_socket_accept($server);<br />
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    /* Grab a packet (1500 is a typical MTU size) of OOB data */<br />
    echo "Received Out-Of-Band: '" . stream_socket_recvfrom($socket, 1500, STREAM_OOB) . "'\n";<br />
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    /* Take a peek at the normal in-band data, but don't comsume it. */<br />
    echo "Data: '" . stream_socket_recvfrom($socket, 1500, STREAM_PEEK) . "'\n";<br />
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    /* Get the exact same packet again, but remove it from the buffer this time. */<br />
    echo "Data: '" . stream_socket_recvfrom($socket, 1500) . "'\n";<br />
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/* Close it up */<br />
fclose($socket);<br />
fclose($server);