Migrating PHP version

The only possible thing that would cause any sort of an issue with migrating from PHP5.2.x to PHP5.4.x would be if you have added PHP/php.ini handler .htaccess code in your Root .htaccess file. BPS does not come with or include php/php.ini handler .htaccess code.

php/php.ini handler .htaccess code tells/instructs the/your Server a couple of things: What php version you want to run on your website and where to look for a custom php.ini file under your website folders if you have created a custom php.ini file for your website.

http://www.php.net/manual/en/migration54.ini.php