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run code in 200+ php & hhvm versions
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<?php foreach(array("Asia/Calcutta", "Asia/Rangoon") as $tz) {echo $tz,"=", (int)in_array($tz, timezone_identifiers_list()), "\n";}
based on j1kGV
Output for 5.6.28, 7.0.20 - 7.2.0
Asia/Calcutta=0 Asia/Rangoon=0
Output for 5.3.18 - 5.6.21, 7.0.0 - 7.0.6
Asia/Calcutta=0 Asia/Rangoon=1