pear shows a weird PHP warning every time I execute any command

Whenever I use pear, I get this strange warning message:

$ pear list
PHP Warning:  Module 'sqlite3' already loaded in Unknown on line 0

Warning: Module 'sqlite3' already loaded开发者_运维知识库 in Unknown on line 0
...
...

It always shows up. Strangely, pear seems to be functioning just fine. Is this a common problem? Does anyone know how to fix it? I'm running Leopard 10.5.8, here's my version:

$ pear version
PHP Warning:  Module 'sqlite3' already loaded in Unknown on line 0

Warning: Module 'sqlite3' already loaded in Unknown on line 0
PEAR Version: 1.9.4
PHP Version: 5.3.6
Zend Engine Version: 2.3.0
Running on: Darwin robert-martins-mac.local 9.8.0 Darwin Kernel Version 9.8.0: \
Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386

Edit: Solution found. For posterity, the problem was my php.ini file. I was including a module in php.ini (sqlite3) that was already compiled into php. The site that solved this for me was this: http://www.somacon.com/p520.php

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EDIT I am aware the following answer has nothing to do with the question. I screwed up. I keep this answer posted because of the comments below.

Without code to look at, this is a shot into the blue, but I would make sure to use

include_once() and require_once()

instead of

include() and require()

While the *_once() take the fraction of a millisecond longer to execute, they make sure that libraries are not loaded twice ... thus getting rid of these kind of warnings.

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The problem was my php.ini file.

I was including a module in php.ini (sqlite3) that was already compiled into php. The site that solved this for me was this: http://www.somacon.com/p520.php