On PHPEverywhere John Lim has posted some of his experiences in his migration up from PHP 5.2 to version 5.3 for his site, including code issues and how he upgraded.

Now that PHP 5.2 is at the end of life, we are starting to migrate to PHP 5.3.

Things he mentions are:

• The deprecation of session_register
• The change of creating a new object by reference
• Other deprecated functions listed here
• His commands to upgrade his Zend Server instance from 5.2 to 5.3