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<?php $time_zones = ['America/Indiana/Indianapolis', 'Atlantic/Reykjavik']; foreach ($time_zones as $tz_name) { $abbrev = DateTimeZone::listAbbreviations(); $abbrev = array_merge( ...array_values( $abbrev ) ); $abbrev = array_filter( $abbrev, function ( $entry ) use ( $tz_name ) { return $entry['timezone_id'] === $tz_name; } ); $does_dst = in_array( true, array_column( $abbrev, 'dst' ), true ); var_dump( $tz_name, $does_dst ); }
Output for 7.0.26 - 7.0.33, 7.1.12 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1 - 8.4.2
string(28) "America/Indiana/Indianapolis" bool(true) string(18) "Atlantic/Reykjavik" bool(false)
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.25, 7.1.0 - 7.1.11
string(28) "America/Indiana/Indianapolis" bool(true) string(18) "Atlantic/Reykjavik" bool(true)
Output for 5.5.0 - 5.5.38
Parse error: syntax error, unexpected '.' in /in/qupTB on line 7
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '.', expecting ')' in /in/qupTB on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/qupTB on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/qupTB on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/qupTB on line 3
Process exited with code 255.
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