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>章 46. Zend API：深入 PHP 内核</TD
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>Using Extensions</A
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><P
> Depending on the build process you selected, you should either end up
with a new PHP binary to be linked into your Web server (or run as CGI), or with an .so (shared object) file. If you compiled the
example file <TT
CLASS="filename"
>first_module.c</TT
> as a shared object, your result file
should be <TT
CLASS="filename"
>first_module.so</TT
>. To use it, you first have to copy
it to a place from which it's accessible to PHP. For a simple test procedure,
you can copy it to your <TT
CLASS="filename"
>htdocs</TT
> directory and try it with
the source in <A
HREF="zend.using.html#example.testfile"
>例 46-3</A
>.
If you compiled it into the PHP binary,
omit the call to <B
CLASS="function"
>dl()</B
>, as the module's
functionality is instantly available to your scripts.
<DIV
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>警告</B
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><P
> For security reasons, you <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>should not</I
></SPAN
> put your
dynamic modules into publicly accessible directories. Even though it <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>can</I
></SPAN
> be
done and it simplifies testing, you should put them into a separate directory
in production environments.
</P
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>
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><B
>例 46-3. A test file for first_module.so.</B
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><code><font color="#000000">
<font color="#0000BB"><?php<br /> <br /></font><font color="#FF8000">// remove next comment if necessary<br />// dl("first_module.so"); <br /><br /></font><font color="#0000BB">$param </font><font color="#007700">= </font><font color="#0000BB">2</font><font color="#007700">;<br /></font><font color="#0000BB">$return </font><font color="#007700">= </font><font color="#0000BB">first_module</font><font color="#007700">(</font><font color="#0000BB">$param</font><font color="#007700">);<br /><br />print(</font><font color="#DD0000">"We sent '$param' and got '$return'"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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><P
> Calling this PHP file should output the following:
We sent '2' and got '2'
</P
><P
> If required, the dynamic loadable module is loaded by calling the
<B
CLASS="function"
>dl()</B
> function. This function looks for the
specified shared object, loads it, and makes its functions
available to PHP. The module exports the function
<B
CLASS="function"
>first_module()</B
>, which accepts a single
parameter, converts it to an integer, and returns the result of the
conversion.
</P
><P
> If you've gotten this far, congratulations! You just built your
first extension to PHP.
</P
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