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# Using Extensions

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 `first_module.c` as a shared object, your result file should be `first_module.so`. 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 `htdocs` directory and try it with the source in Example 46-3. If you compiled it into the PHP binary, omit the call to dl(), as the module's functionality is instantly available to your scripts.

Warning
For security reasons, you should not put your dynamic modules into publicly accessible directories. Even though it can be done and it simplifies testing, you should put them into a separate directory in production environments.

Example 46-3. A test file for first_module.so.
`<?php // remove next comment if necessary // dl("first_module.so"); $param = 2; $return = first_module($param); print("We sent '$param' and got '$return'"); ?>`

Calling this PHP file should output the following: We sent '2' and got '2'

If required, the dynamic loadable module is loaded by calling the dl() function. This function looks for the specified shared object, loads it, and makes its functions available to PHP. The module exports the function first_module(), which accepts a single parameter, converts it to an integer, and returns the result of the conversion.

If you've gotten this far, congratulations! You just built your first extension to PHP.

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