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>stream_socket_enable_crypto</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN223784"
></A
><P
>    (PHP 5 &#62;= 5.1.0RC1)</P
>stream_socket_enable_crypto&nbsp;--&nbsp;
     Turns encryption on/off on an already connected socket
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN223787"
></A
><H2
>Description</H2
>mixed <B
CLASS="methodname"
>stream_socket_enable_crypto</B
> ( resource stream, bool enable [, int crypto_type [, resource session_stream]] )<BR
></BR
><P
>&#13;     When called with the <CODE
CLASS="parameter"
>crypto_type</CODE
> parameter,
     <B
CLASS="function"
>stream_socket_enable_crypto()</B
> will setup
     encryption on the stream using the specified method.
    </P
><P
>&#13;     Valid values for <CODE
CLASS="parameter"
>crypto_type</CODE
>
     <P
></P
><UL
><LI
><P
><TT
CLASS="constant"
><B
>STREAM_CRYPTO_METHOD_SSLv2_CLIENT</B
></TT
></P
></LI
><LI
><P
><TT
CLASS="constant"
><B
>STREAM_CRYPTO_METHOD_SSLv3_CLIENT</B
></TT
></P
></LI
><LI
><P
><TT
CLASS="constant"
><B
>STREAM_CRYPTO_METHOD_SSLv23_CLIENT</B
></TT
></P
></LI
><LI
><P
><TT
CLASS="constant"
><B
>STREAM_CRYPTO_METHOD_TLS_CLIENT</B
></TT
></P
></LI
><LI
><P
><TT
CLASS="constant"
><B
>STREAM_CRYPTO_METHOD_SSLv2_SERVER</B
></TT
></P
></LI
><LI
><P
><TT
CLASS="constant"
><B
>STREAM_CRYPTO_METHOD_SSLv3_SERVER</B
></TT
></P
></LI
><LI
><P
><TT
CLASS="constant"
><B
>STREAM_CRYPTO_METHOD_SSLv23_SERVER</B
></TT
></P
></LI
><LI
><P
><TT
CLASS="constant"
><B
>STREAM_CRYPTO_METHOD_TLS_SERVER</B
></TT
></P
></LI
></UL
>
    </P
><P
>&#13;     Once the crypto settings are established, cryptography can be turned
     on and off dynamically by passing <TT
CLASS="constant"
><B
>TRUE</B
></TT
> or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> in the
     <CODE
CLASS="parameter"
>enable</CODE
> parameter.
    </P
><P
>&#13;     If this stream should be seeded with settings from an already established
     crypto enabled stream, pass that stream's resource variable
     in the fourth parameter.
    </P
><P
>&#13;     Returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> on success, <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if negotiation has failed or
     <TT
CLASS="literal"
>0</TT
> if there isn't enough data and you should try again
     (only for non-blocking sockets).
    </P
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><TD
><DIV
CLASS="example"
><A
NAME="AEN223843"
></A
><P
><B
>例 1. <B
CLASS="function"
>stream_socket_enable_crypto()</B
> Example</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$fp </font><font color="#007700">= </font><font color="#0000BB">stream_socket_client</font><font color="#007700">(</font><font color="#DD0000">"tcp://myproto.example.com:31337"</font><font color="#007700">, </font><font color="#0000BB">$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;die(</font><font color="#DD0000">"Unable to connect: $errstr ($errno)"</font><font color="#007700">);<br />}<br /></font><font color="#FF8000">/* Turn on encryption for login phase */<br /></font><font color="#0000BB">stream_socket_enable_crypto</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">, </font><font color="#0000BB">STREAM_CRYPTO_METHOD_SSLv23_CLIENT</font><font color="#007700">);<br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"USER god\r\n"</font><font color="#007700">);<br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"PASS secret\r\n"</font><font color="#007700">);<br /></font><font color="#FF8000">/* Turn off encryption for the rest */<br /></font><font color="#0000BB">stream_socket_enable_crypto</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">false</font><font color="#007700">);<br />while (</font><font color="#0000BB">$motd </font><font color="#007700">= </font><font color="#0000BB">fgets</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">)) {<br />&nbsp;&nbsp;echo </font><font color="#0000BB">$motd</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><P
>&#13;     <A
HREF="ref.openssl.html"
>参考 CXII, <I
>OpenSSL Functions</I
></A
>, and
     <A
HREF="transports.html"
>附录 P</A
>
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