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<?php foreach(array("Asia/Calcutta", "Asia/Kolkata") as $tz) { var_dump(array($tz, in_array($tz, timezone_identifiers_list()))); }
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(13) "Asia/Calcutta" [1]=> bool(false) } array(2) { [0]=> string(12) "Asia/Kolkata" [1]=> bool(true) }

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