Fatal error: Call to undefined function mysqli_init()

I have a really strange error. My httpd server have been working fine until last Wednesday, when I uninstalled the MS SQL and visual studio C#. When I restarted the PC, Ii discovered that some parts of the Environment variable PATH disappeared...Almost all the problems where recovered, The only one that cannot be adjusted is my httpd server... or the PHP configuration, I don't know. I have already uninstalled the Apache server, PHP and MySql and resintalled them again... I have done this lots of times on other PCs so I'm sure that it should work...but I'm missing something.

The worst thing is that the data I get when I do in cmd "php -i" is different form the data I get form a page info.php like this:

<?php
phpinfo();
?>

The page doesn't show any info about the mysqli configuration...

can any body help me? I'm trying anything to avoid formatting the PC!!!

Thank开发者_如何学Cs in advance

Update:::::::::::::::::::::::::: With phpinfo I find:

Configuration File (php.ini) Path   C:\WINDOWS
Loaded Configuration File   C:\PHP\php.ini 

In C:\windows there's no php.ini file. Where else can PHP find other configurations?

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Open the folder you installed PHP Edit php.ini file

If no php.ini exists, copy one of the php.ini/Production/Development to php.ini

uncomment
    extension=php_mysqli.dll

if you have not installed php in the default folder... or if you have the php extensions in a separated folder change the extension_dir to the correct path

change
    extension_dir = "C:/APL/php/ext/"