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php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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><H1
><A
NAME="function.fsockopen"
></A
>fsockopen</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN148996"
></A
><P
>    (PHP 3, PHP 4, PHP 5)</P
>fsockopen&nbsp;--&nbsp;
     Open Internet or Unix domain socket connection
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN148999"
></A
><H2
>Description</H2
>resource <B
CLASS="methodname"
>fsockopen</B
> ( string target [, int port [, int &#38;errno [, string &#38;errstr [, float timeout]]]] )<BR
></BR
><P
>&#13;     Initiates a socket connection to the resource specified by
     <CODE
CLASS="parameter"
>target</CODE
>. PHP supports
     targets in the Internet and Unix domains as described in
     <A
HREF="transports.html"
>附录 P</A
>.  A list of supported transports
     can also be retrieved using <A
HREF="function.stream-get-transports.html"
><B
CLASS="function"
>stream_get_transports()</B
></A
>.
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
      If you need to set a timeout for reading/writing data over the socket,
      use <A
HREF="function.stream-set-timeout.html"
><B
CLASS="function"
>stream_set_timeout()</B
></A
>, as the <CODE
CLASS="parameter"
>timeout</CODE
>
      parameter to <B
CLASS="function"
>fsockopen()</B
> only applies while
      connecting the socket.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     As of PHP 4.3.0, if you have compiled in OpenSSL support, you may
     prefix the <CODE
CLASS="parameter"
>hostname</CODE
> with either
     '<TT
CLASS="literal"
>ssl://</TT
>' or '<TT
CLASS="literal"
>tls://</TT
>' to
     use an SSL or TLS client connection over TCP/IP to connect
     to the remote host.
    </P
><P
>&#13;     <B
CLASS="function"
>fsockopen()</B
> returns a file pointer which may
     be used together with the other file functions (such as
     <A
HREF="function.fgets.html"
><B
CLASS="function"
>fgets()</B
></A
>, <A
HREF="function.fgetss.html"
><B
CLASS="function"
>fgetss()</B
></A
>,
     <A
HREF="function.fwrite.html"
><B
CLASS="function"
>fwrite()</B
></A
>, <A
HREF="function.fclose.html"
><B
CLASS="function"
>fclose()</B
></A
>, and
     <A
HREF="function.feof.html"
><B
CLASS="function"
>feof()</B
></A
>).
    </P
><P
>&#13;     If the call fails, it will return <TT
CLASS="constant"
><B
>FALSE</B
></TT
> and if the optional
     <CODE
CLASS="parameter"
>errno</CODE
> and <CODE
CLASS="parameter"
>errstr</CODE
>
     arguments are present they will be set to indicate the actual
     system level error that occurred in the system-level
     <TT
CLASS="literal"
>connect()</TT
> call. If the value returned in
     <CODE
CLASS="parameter"
>errno</CODE
> is <TT
CLASS="literal"
>0</TT
> and the
     function returned <TT
CLASS="constant"
><B
>FALSE</B
></TT
>, it is an indication that the error
     occurred before the <TT
CLASS="literal"
>connect()</TT
> call. This is
     most likely due to a problem initializing the socket. Note that
     the <CODE
CLASS="parameter"
>errno</CODE
> and
     <CODE
CLASS="parameter"
>errstr</CODE
> arguments will always be passed by
     reference.
    </P
><P
>&#13;     Depending on the environment, the Unix domain or the optional
     connect timeout may not be available.
    </P
><P
>&#13;     The socket will by default be opened in blocking mode.  You can
     switch it to non-blocking mode by using
     <A
HREF="function.stream-set-blocking.html"
><B
CLASS="function"
>stream_set_blocking()</B
></A
>.
     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN149053"
></A
><P
><B
>例 1. <B
CLASS="function"
>fsockopen()</B
> Example</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$fp </font><font color="#007700">= </font><font color="#0000BB">fsockopen</font><font color="#007700">(</font><font color="#DD0000">"www.example.com"</font><font color="#007700">, </font><font color="#0000BB">80</font><font color="#007700">, </font><font color="#0000BB">$errno</font><font color="#007700">, </font><font color="#0000BB">$errstr</font><font color="#007700">, </font><font color="#0000BB">30</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$fp</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"$errstr ($errno)&lt;br /&gt;</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br />} else {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$out </font><font color="#007700">= </font><font color="#DD0000">"GET / HTTP/1.1\r\n"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$out </font><font color="#007700">.= </font><font color="#DD0000">"Host: www.example.com\r\n"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$out </font><font color="#007700">.= </font><font color="#DD0000">"Connection: Close\r\n\r\n"</font><font color="#007700">;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">$out</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;while (!</font><font color="#0000BB">feof</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#0000BB">fgets</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">128</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
     The example below shows how to retrieve the day and time
     from the UDP service "daytime" (port 13) in your own machine.
     <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN149057"
></A
><P
><B
>例 2. Using UDP connection</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$fp </font><font color="#007700">= </font><font color="#0000BB">fsockopen</font><font color="#007700">(</font><font color="#DD0000">"udp://127.0.0.1"</font><font color="#007700">, </font><font color="#0000BB">13</font><font color="#007700">, </font><font color="#0000BB">$errno</font><font color="#007700">, </font><font color="#0000BB">$errstr</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$fp</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"ERROR: $errno - $errstr&lt;br /&gt;</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br />} else {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"\n"</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#0000BB">fread</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">26</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
     <DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>警告</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>&#13;        UDP sockets will sometimes appear to have opened without an error,
        even if the remote host is unreachable.  The error will only
        become apparent when you read or write data to/from the socket.
        The reason for this is because UDP is a "connectionless" protocol,
        which means that the operating system does not try to establish
        a link for the socket until it actually needs to send or receive data.
      </P
></TD
></TR
></TABLE
></DIV
>
     <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>当指定数字的
IPv6 地址（例如 fe80::1）时必须将 IP 地址放在方括号内。例如
<TT
CLASS="literal"
>tcp://[fe80::1]:80</TT
>。</P
></BLOCKQUOTE
></DIV
>
     <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>The timeout parameter was introduced in PHP 3.0.9 and
      UDP support was added in PHP 4.
      </P
></BLOCKQUOTE
></DIV
>
     See also <A
HREF="function.pfsockopen.html"
><B
CLASS="function"
>pfsockopen()</B
></A
>, 
     <A
HREF="function.stream-set-blocking.html"
><B
CLASS="function"
>stream_set_blocking()</B
></A
>,
     <A
HREF="function.stream-set-timeout.html"
><B
CLASS="function"
>stream_set_timeout()</B
></A
>, <A
HREF="function.fgets.html"
><B
CLASS="function"
>fgets()</B
></A
>,
     <A
HREF="function.fgetss.html"
><B
CLASS="function"
>fgetss()</B
></A
>, <A
HREF="function.fwrite.html"
><B
CLASS="function"
>fwrite()</B
></A
>,
     <A
HREF="function.fclose.html"
><B
CLASS="function"
>fclose()</B
></A
>, <A
HREF="function.feof.html"
><B
CLASS="function"
>feof()</B
></A
>, and
     the <A
HREF="ref.curl.html"
>Curl extension</A
>.
    </P
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