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# PHP Integration

This section is aimed at PHP developers and explains how to use and customize PHPTAL behaviors for simple and advanced usage.

- `PHPTAL`: the main PHPTAL class. It is used to load and execute templates.

- `PHPTAL_Filter`: filtering template sources and PHPTAL output.

- `PHPTAL_Trigger`: handles output of elements with `phptal:id`.

- `PHPTAL_TranslationService`: for replacing the built-in `gettext` support with your own internationalization system.

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Expression chains | Home | class `PHPTAL`