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<?php var_Dump(timezone_name_from_abbr('WEST')); var_dump(in_array(timezone_name_from_abbr('WEST'), timezone_identifiers_list()));
based on PGaNh
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
string(12) "Europe/Paris" bool(true)