Find a very depressing thing, please count

I found a very depressing thing. I tried to install apache for the first time and set it according to the tutorial. but when I used phpinfo (), I found that extension_dir showed C: \ php5, ah, I am in php. in ini, it is "D: \ php \ ext". apache httpd. con finds a very depressing thing.
I installed apache for the first time and set it according to the tutorial. but when I used phpinfo (), I found that extension_dir showed C: \ php5. I am in php. in ini, it is "D: \ php \ ext". apache httpd. the phpinidir settings in the conf configuration are also "D:/PHP/". all the settings are correct. since phpinfo () can be displayed, apache and php can both run, the extension_dir error causes mysql functions to be unable to be called.
I used the win2008 64-bit system, but the software was installed with 32-bit. Originally, php parameters were set in iis. later, the above error could not be found, so I also removed the php settings in iis, but it still does not work. I have been a newbie in php. what I have been doing all the time is. net. Which of the following heroes can give me some tips?
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1. the path is not correct (check the path writing method)

2. php. ini loads files from other locations (check whether the php. ini path in phpinfo is consistent)
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PHPIniDir "D:/php"
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It does not matter!
However, win2008 is very strict with application management and may encounter odd errors due to permission issues.
We recommend that you store apache, mysql, and php in a non-system directory.