PHP Warning: Module already loaded in Unknown on line 0

To fix this problem, you must edit your php.ini (or extensions.ini) file and comment-out the extensions that are already compiled-in. For example, after editing, your ini file may look like the lines below:

;extension=pcre.so
;extension=spl.so

Source: http://www.somacon.com/p520.php

I had the same issue on mac i.e. Warning: Module 'pdo_pgsql' already loaded in Unknown on line 0. Here's how I solved it.

• Locate the folder conf.d, mine was in the directory /usr/local/etc/php/7.0/conf.d.
• In this folder, there's a file called ext-pdo_pgsql.ini.
• Type sudo nano ext-pdo_pgsql.ini to edit it.
• There should be a line extension="/usr/local/opt/php70-pdo-pgsql/pdo_pgsql.so". Comment it out by adding semi-colon to the beginning of the line i.e. ;extension="/usr/local/opt/php70-pdo-pgsql/pdo_pgsql.so".
• Save the file. (I usually run control + O, control + M).
• Exit the file (control + X).

Hope this helps someone.

I think you have loaded Xdebug probably twice in php.ini.

1. check the php.ini, that not have set xdebug.so for the values extension= and zend_extension=.

2. Check also /etc/php5/apache2 and /etc/php5/cli/. You should not load in each php.ini in these directories the extension xdebug.so. Only one file, php.ini should load it.

   Note: Inside the path is the string /etc/php5. The 5 is the version of PHP. So if you use another version, you always get a different path, like php7.