[FIXED] Why does PHP PEAR report that it can't find some DLL's on Windows?

Issue

I'm trying to do a system wide install of PEAR on my web server. When I execute go-pear.bat in the PHP installation folder from the command line I get the following error windows popping up:

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php.exe - Unable To Locate Component
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This application has failed to start because php_mbstring.dll was not found. 
Re-installing the application may fix this problem. 

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php.exe - Unable To Locate Component
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This application has failed to start because php_pdo.dll was not found. 
Re-installing the application may fix this problem. 

I also see the following warnings emitted in the command line window by the script:

PHP Warning:  PHP Startup: Unable to load dynamic library './ext/php_exif.dll' - The specified modul
e could not be found.
 in Unknown on line 0

All of these modules are configured in the php.ini file (which resides in the php install folder c:\php).

They are also reported correctly by php_info().

I'm running PHP 5.2.6 Windows Non thread safe build on FastCGI on IIS6.

Update:

I've also tried (as suggested by acrosman) setting extension_dir=c:\php and extension_dir=c:\php\ext but without success.

I'm also remembering to kill the php-cgi.exe process (FastCGI keeps it alive) after each php.ini modification to force a re-read.

Update 2:

This looks like a PHP issue and not an issue with PEAR, running php.exe from the command line generates the same errors.

Solution

Solved. It turns out that php.exe needs to see the PHP extensions (c:\php\ext) folder in the system PATH.

Answered By - Kev

Answer Checked By - Katrina (PHPFixing Volunteer)