Description:
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This is not really a bug, rather it is a suggestion to who prepared the "install.txt" file. In the "install.txt" where "Installing PHP for Apache as module", there is a missing option for where the php.ini can be located.

Where do I have to put the php.ini ?
   The php.ini files is only searched in two places:
   1) in your Apache installation directory (e.g. c:\apache\apache)
   2) in your %SYSTEMROOT% directory.

This is option 3) add a directive:

PHPIniDir "C:/PHP"

into your httpd.conf or srm.conf. Replace "C:/PHP" by the directory path where your php.ini located.