New Global Constants
Changes to PHP Internals
Migrating from PHP 5.4.x to PHP 5.5.x
PHP Manual

## Changes to INI file handling

### Intl

The intl.use_exceptions configuration directive has been added, which controls the behaviour of intl when global errors occur in conjunction with the already extant intl.error_level configuration directive.

### MySQLnd

The mysqlnd.sha256_server_public_key configuration directive has been added to allow mysqli to use the new MySQL authentication protocol.

New Global Constants
Changes to PHP Internals
Migrating from PHP 5.4.x to PHP 5.5.x
PHP Manual