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><P
> This section contains the context options supported by the wrappers that
work over sockets, like <TT
CLASS="literal"
>tcp</TT
>, <TT
CLASS="literal"
>http</TT
> or
<TT
CLASS="literal"
>ftp</TT
>.
</P
><P
> As of PHP 5.1.0 only one option is supported, <TT
CLASS="literal"
>bindto</TT
>,
which can be used to specify the IP address (either IPv4 or IPv6) and/or
the port number that PHP will use to access the network. The syntax is
<TT
CLASS="literal"
>ip:port</TT
> (you can set the IP or the port number to
<TT
CLASS="literal"
>0</TT
> if you want to let the system choose them for you).
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><B
>Nota: </B
>
As FTP creates two socket connections during normal operation, you cannot
specify the port number in the <TT
CLASS="literal"
>bindto</TT
> option. So, the
only supported syntax is <TT
CLASS="literal"
>ip:0</TT
> for the FTP wrapper.
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>Exemplo N-1. Some examples of how to use the bindto option</B
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><code><font color="#000000">
<font color="#0000BB"><?php<br /></font><font color="#FF8000">// connect to the internet using the '192.168.0.100' IP<br /></font><font color="#0000BB">$opts </font><font color="#007700">= array(</font><font color="#DD0000">'socket' </font><font color="#007700">=><br /> array(</font><font color="#DD0000">'bindto' </font><font color="#007700">=> </font><font color="#DD0000">'192.168.0.100:0'</font><font color="#007700">));<br /><br /><br /></font><font color="#FF8000">// connect to the internet using the '192.168.0.100' IP and port '7000'<br /></font><font color="#0000BB">$opts </font><font color="#007700">= array(</font><font color="#DD0000">'socket' </font><font color="#007700">=><br /> array(</font><font color="#DD0000">'bindto' </font><font color="#007700">=> </font><font color="#DD0000">'192.168.0.100:7000'</font><font color="#007700">));<br /><br /><br /></font><font color="#FF8000">// connect to the internet using port '7000'<br /></font><font color="#0000BB">$opts </font><font color="#007700">= array(</font><font color="#DD0000">'socket' </font><font color="#007700">=><br /> array(</font><font color="#DD0000">'bindto' </font><font color="#007700">=> </font><font color="#DD0000">'0:7000'</font><font color="#007700">));<br /><br /><br /></font><font color="#FF8000">// create the context...<br /></font><font color="#0000BB">$context </font><font color="#007700">= </font><font color="#0000BB">stream_context_create</font><font color="#007700">(</font><font color="#0000BB">$opts</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// ...and use it to fetch the data<br /></font><font color="#007700">echo </font><font color="#0000BB">file_get_contents</font><font color="#007700">(</font><font color="#DD0000">'http://www.example.com'</font><font color="#007700">, </font><font color="#0000BB">false</font><font color="#007700">, </font><font color="#0000BB">$context</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?></font>
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