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><A
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>socket_get_option</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN213133"
></A
><P
> (PHP 4 >= 4.3.0, PHP 5)</P
>socket_get_option -- Gets socket options for the socket </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN213136"
></A
><H2
>Description</H2
>mixed <B
CLASS="methodname"
>socket_get_option</B
> ( resource socket, int level, int optname )<BR
></BR
><P
> The <B
CLASS="function"
>socket_get_option()</B
> function retrieves the value for
the option specified by the <CODE
CLASS="parameter"
>optname</CODE
> parameter for the
socket specified by the <CODE
CLASS="parameter"
>socket</CODE
> parameter. <B
CLASS="function"
>socket_get_option()</B
>
will return <TT
CLASS="constant"
><B
>FALSE</B
></TT
> on failure.
</P
><P
> The <CODE
CLASS="parameter"
>level</CODE
> parameter specifies the protocol level at
which the option resides. For example, to retrieve options at the socket level,
a <CODE
CLASS="parameter"
>level</CODE
> parameter of SOL_SOCKET would be used. Other
levels, such as TCP, can be used by specifying the protocol number of that level.
Protocol numbers can be found by using the <A
HREF="function.getprotobyname.html"
><B
CLASS="function"
>getprotobyname()</B
></A
> function.
</P
><DIV
CLASS="table"
><A
NAME="AEN213160"
></A
><P
><B
>表 1. Available Socket Options</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Option</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
>SO_DEBUG</TD
><TD
> Reports whether debugging information is being recorded.
</TD
></TR
><TR
><TD
>SO_ACCEPTCONN</TD
><TD
> Reports whether socket listening is enabled.
</TD
></TR
><TR
><TD
>SO_BROADCAST</TD
><TD
> Reports whether transmission of broadcast messages is supported.
</TD
></TR
><TR
><TD
>SO_REUSEADDR</TD
><TD
> Reports whether local addresses can be reused.
</TD
></TR
><TR
><TD
>SO_KEEPALIVE</TD
><TD
> Reports whether connections are kept active with periodic transmission
of messages. If the connected socket fails to respond to these messages,
the connection is broken and processes writing to that socket are notified
with a SIGPIPE signal.
</TD
></TR
><TR
><TD
>SO_LINGER</TD
><TD
> Reports whether the <CODE
CLASS="parameter"
>socket</CODE
> lingers on <A
HREF="function.socket-close.html"
><B
CLASS="function"
>socket_close()</B
></A
> if data is present.
</TD
></TR
><TR
><TD
>SO_OOBINLINE</TD
><TD
> Reports whether the <CODE
CLASS="parameter"
>socket</CODE
> leaves out-of-band data inline.
</TD
></TR
><TR
><TD
>SO_SNDBUF</TD
><TD
> Reports send buffer size information.
</TD
></TR
><TR
><TD
>SO_RCVBUF</TD
><TD
> Reports recieve buffer size information.
</TD
></TR
><TR
><TD
>SO_ERROR</TD
><TD
> Reports information about error status and clears it.
</TD
></TR
><TR
><TD
>SO_TYPE</TD
><TD
> Reports the <CODE
CLASS="parameter"
>socket</CODE
> type.
</TD
></TR
><TR
><TD
>SO_DONTROUTE</TD
><TD
> Reports whether outgoing messages bypass the standard routing facilities.
</TD
></TR
><TR
><TD
>SO_RCVLOWAT</TD
><TD
> Reports the minimum number of bytes to process for <CODE
CLASS="parameter"
>socket</CODE
> input operations.
( Defaults to 1 )
</TD
></TR
><TR
><TD
>SO_RCVTIMEO</TD
><TD
> Reports the timeout value for input operations.
</TD
></TR
><TR
><TD
>SO_SNDLOWAT</TD
><TD
> Reports the minimum number of bytes to process for <CODE
CLASS="parameter"
>socket</CODE
> output operations.
</TD
></TR
><TR
><TD
>SO_SNDTIMEO</TD
><TD
> Reports the timeout value specifying the amount of time that an output
function blocks because flow control prevents data from being sent.
</TD
></TR
></TBODY
></TABLE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
This function used to be called <TT
CLASS="literal"
>socket_getopt()</TT
> prior
to PHP 4.3.0
</P
></BLOCKQUOTE
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