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<?php var_dump(DateTimeZone::listIdentifiers( DateTimeZone::PER_COUNTRY, "BR" ));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
array(16) { [0]=> string(17) "America/Araguaina" [1]=> string(13) "America/Bahia" [2]=> string(13) "America/Belem" [3]=> string(17) "America/Boa_Vista" [4]=> string(20) "America/Campo_Grande" [5]=> string(14) "America/Cuiaba" [6]=> string(16) "America/Eirunepe" [7]=> string(17) "America/Fortaleza" [8]=> string(14) "America/Maceio" [9]=> string(14) "America/Manaus" [10]=> string(15) "America/Noronha" [11]=> string(19) "America/Porto_Velho" [12]=> string(14) "America/Recife" [13]=> string(18) "America/Rio_Branco" [14]=> string(16) "America/Santarem" [15]=> string(17) "America/Sao_Paulo" }

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