PHP Manual
Appendices
Migrating from PHP 5.4.x to PHP 5.5.x
What has changed in PHP 5.5.x
Backward Incompatible Changes
New features
Deprecated features in PHP 5.5.x
Changed Functions
New Functions
New Classes and Interfaces
New Methods
Other changes to extensions
New Global Constants
Changes to INI file handling
Changes to PHP Internals
New Methods
New Global Constants
Migrating from PHP 5.4.x to PHP 5.5.x
PHP Manual
Other changes to extensions
Intl
The
intl
extension now requires ICU 4.0 or later.