Where is php.ini located?

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Well it depends on the Linux distribution you are using, the version of php and the way you install it with Apache web server. Php.ini may be here:

/etc/php.ini

Or here:

/etc/php/php.ini
/etc/php5/php.ini

Or here:

/usr/bin/php5/bin/php.ini

Anyway, you can always find any file named php.ini in this manner

find / -name php.ini

The simplest yet most powerful usage of the renowned find command. By its help I was able to locate the php.ini on my Ubuntu 9.04 Apache2 and PHP5:

/etc/php5/apache2/php.ini

Use phpinfo() to find out

Write a simple PHP file with the following content:

<?php phpinfo();

And upload it to your server and access it in your web browser to get a page like this: