WPML : how to determine manually the language in which a given page is displayed

Somewhere in my code I need to know what is the current language and display a certain custom field or another one based on this knowledge.

How can I know this information ?

WPML defines constants that you can use go get the current language:

• ICL_LANGUAGE_CODE – current language code (eg: en,fr,sp).
• ICL_LANGUAGE_NAME_EN – Name of the current language in English (eg: English, French. Spanish).
• ICL_LANGUAGE_NAME – Name of current language, in the current language (eg: English, Français, Español).