I checked Installation prerequisites before upgrading my PHP version and it reads as:
PHP
Make sure that your PHP (5.1 or greater) installation is in order.
After upgrading to PHP 5.5,MyDBR login page gave an error about ioncube loader. I copied the ioncube loader file for 5.5, updated php.ini and restarted my web server.
MyDBR started giving blank page after that and nginx error log shows this:
*72 FastCGI sent in stderr: "PHP message: PHP Fatal error: The file /path/mydbr/index.php was encoded by the ionCube Encoder for PHP 5 and cannot run under PHP 5.5.
Please ask the provider of the script to provide a version encoded with the ionCube Encoder for either PHP 5.3 or PHP 5.4 or PHP 5.5. in Unknown on line 0" while reading response header from upstream,