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<?php var_dump(timezone_name_from_abbr("", 0, -1)); var_dump(timezone_name_from_abbr("", 0, 0)); var_dump(timezone_name_from_abbr("", 0, 1));
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
bool(false) string(13) "Europe/London" string(15) "Atlantic/Azores"

preferences:
145.35 ms | 408 KiB | 5 Q