php - Load unicode character map when user select the language -

i know question bit vague , not sure possible. on web site want display combo box maximum possible languages (available in unicode) , when user selects language respective character map of language should loaded. users can click , complete given text area comments in own language. not asking code kind guide line possibility of , way helpful. ultimate need give user type in language of choice. users need install language in computer before using it? thank you.

the unicode standard not divide characters language, , there no rigorous definition concept “characters used in language”. example, “é” character used in english? (think “fiancé”.) “è”? (think spelling “belovèd” used in forms of writing.)

the unicode consortium has created cldr database, contains information “exemplar characters” in languages, these based on subjective judgement , debatable – in sense of covering much, might not serious here. data in xml formal, automatically fed application.

there nothing user needs do, or do, “install language” purposes this. matters whether user’s computer has fonts containing characters needed , whether browser able use them.