some PHP extensions unable to load with Apache

Upon startup of a localhost Apache HTTPD 2.2.11 under Windows XP Pro SP
3 and with PHP 5.2.10, in the Apache error.log I'm getting a warning
message of the form...
[CODE]PHP Warning: PHP Startup: Unable to load dynamic library
'D:\\Server\\PHP\\ext\\xxxxx.dll' - The specified procedure
could not be found.\r\n in Unknown on line 0[/CODE]
.....for each of: php_bz2.dll, php_pdo, php_pdo_mysql, php_xmlrpc.

I do [I]not [/I]get any such warning for the several other PHP
extensions that are loaded, such as mysqli.dll. (And that extension is
functioning as expected.)

Each of the corresponding extensions was installed with PHP, and the
dll's are in my PHP\ext directory; php.ini of course includes the
corresponding extension=... statements.

Of course, php.ini of course includes:
[CODE]extension_dir="D:\Server\PHP\ext"[/CODE]
And httpd.conf includes:
[CODE]PHPIniDir "D:/Server/PHP/"
LoadModule php5_module "D:/Server/PHP/php5apache2_2.dll"[/CODE]

My Windows environment variable path includes D:\Server\PHP\ and
D:\Server\PHP\ext at its start.

phpinfo output shows D:\Server\PHP\php.ini -- the one that it should be
finding. And as expected it shows as loaded the modules that are not
generating any warnings, and as not loaded the modules that do generate
the warnings.

I'm running in an administrator account, and there are no permission issues.

In case it's relevant: I have multiple copies of libeay32.dll and
ssleay32.dll in different locations, including a copy of each in
D:\Server\Apache2.2\bin AND in D:\Server\PHP. (There is no copy of
libeay32.dll in C:\Windows\system32, but there is a copy of ssleay32.dll
in C:\Windows\system32\ZoneLabs.)
In D:\Server\Apache2.2\bin, both libeay32.dll and ssleay32.dll are
version 0.9.8.9, whereas in D:\Server\PHP they are both version 0.9.8.11.

What's wrong?

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