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the easiest way to find out where your php.ini file is located is to create a new file in the same directory as your XOOPS files, called
phpinfo.php. In this file add the following:
phpinfo();
?>
Save your file, then access it using your web browser. Look for a setting "Configuration File (php.ini) Path".
Can you briefly describe the environment where your site is installed?
Are you running this from your own machine, or from a web hosting company?
What type of server is it (Windows, Linux (any flavor), BSD)?
If it is a Windows server, is your server running IIS or Apache as its web server software?