Following this guide - How To Use Multiple PHP Versions (PHP-FPM & FastCGI) With ISPConfig 3 (Ubuntu 12.04 LTS) link - https://www.howtoforge.com/how-to-u...-fastcgi-with-ispconfig-3-ubuntu-12.04-lts-p2 I have installed php 5.4.45, which is working fine. Then I have installed ioncube loader as suggested in the guide and added the line in php.ini Code: zend_extension = /opt/phpfcgi-5.4.45/lib/php/extensions/no-debug-non-zts-20100525/ioncube.so Note: - In my installation there is no folder under /opt/phpfcgi-5.4.45/lib/php/ as extensions/no-debug-non-zts-20100525 so I have created those folders. Again there is a ext folder in the path /opt/phpfcgi-5.4.45/include/ext. I also tried to create a folder ioncube and copied the file there and modified the path in php.ini but it didn't help. What I am doing wrong? Thanks.