New Functions
New Methods
Migrating from PHP 5.3.x to PHP 5.4.x
PHP Manual

## New Classes and Interfaces

The following classes were introduced in PHP 5.4.0:

SPL:

- CallbackFilterIterator
- RecursiveCallbackFilterIterator

Reflection:

- ReflectionZendExtension

Json:

- JsonSerializable

Session:

- SessionHandler
- SessionHandlerInterface

Snmp:

- SNMP

Intl:

- Transliterator
- Spoofchecker