Description:
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PHP doesn't parse C:\WINDOWS\my.ini, where charset informations would have been specified for the current webserver. Instead, it tries to locate them somewhere in C:\MySQL\ ... - seems to be hardcoded. It would make more sense to look after C:\WINDOWS\my.ini, and only afterwards trying to hit the charsets directly.

Output while running php.exe when having MySQL-function calls in PHP-Script:

File 'c:\mysql\share\charsets\?.conf' not found (Errcode: 2)
Character set '#5' is not a compiled character set and is not specified in the 'c:\mysql\share\charsets\Index' file

Reproduce code:
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$res_db_conn = mysql_connect($arr_user_data[0],$arr_user_data[1],$arr_user_data[2]);

Expected result:
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File 'c:\mysql\share\charsets\?.conf' not found (Errcode: 2)
Character set '#5' is not a compiled character set and is not specified in the 'c:\mysql\share\charsets\Index' file

Except of this warning (and a disgusting beep), everything works out fine. Very bad when running cron-jobs ;-)