textdomain
Introduction
Human Language and Character Encoding Support
PHP Manual

# Internationalization

- Introduction
- Installing/Configuring
  - Requirements
  - Installation
  - Runtime Configuration
  - Resource Types
- Predefined Constants
- i18n Functions
  - locale_get_default — Get the default Locale
  - locale_set_default — Set the default Locale

textdomain
Introduction
Human Language and Character Encoding Support
PHP Manual