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We are currently running PHP 5.3.25 and will be planning to upgrade to 5.4.x with the next 1 to 4 months from today. This all depends on security, stability and protection for PHP.
This is very important information to read below for both users and website developers.
In PHP 5.3.x we have in place Suhosin http://www.hardened-php.net/suhosin which is an advanced protection system for PHP installations. It was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core.
So in the new PHP 5.4.x Suhosin http://www.hardened-php.net/suhosin will not be compatible and is not being developed for over year now. https://github.com/stefanesser/suhosin
Under PHP 5.4.x older web sites that are running older PHP functions will break websites.
What has changed in PHP 5.4.x
Backward Incompatible Changes
Although most existing PHP 5 code should work without changes, developers please take note of some backward incompatible changes: http://www.php.net/manual/en/migration54.incompatible.php
Migrating from PHP 5.3.x to PHP 5.4.x
Developers should read through these Changes to PHP Internals http://www.php.net/manual/en/migration54.php
Developers need to notice of the changes and start making changes to the code they write so that whenever we do upgrade to PHP 5.4.x the websites they develop will continue to work with no issues.
Users that host on our servers need to make sure the software, PHP scripts and PHP programs support PHP 5.4.x.
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