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Php - Upgrade from 5.3 to 5.5

Wich are the difference from the 5.3 to 5.5 PHP version? It's a list of functions and some advices to keep in mind.
From the 5.3 to 5.4
I started with the oficial link and those are the PHP functions that could give you some problems

- magic quotes (removed)
- register_globals e register_long_arrays (removed)
- Call-time pass by reference (removed)
- The third parameter of ob_start() has changed from boolean erase to integer flags.
- session_is_registered(), session_register() and session_unregister() (removed)

From the 5.4 to 5.5
There isn't removed functions, but some of these are deprecated, like
mysql_* functions, that you need to change with MySQLi or PDO_MySQL

This is the oficial link
Some versions of CMS could not suport PHP 5.5 version, especially the lower/equal versions of Joomla 1.5 and Magento 1.9.
This is the oficial Magento link installation
I advice to upgrade Wordpress to 4.2 too.