Description:
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The description says the offset to GMT is calculated using the timezone set in the DateTime object used. Actually it is calculated using the timezone of the DateTimeZone object itself. This is correctly explained in the example's comment.

Also the Example #1 says it is an example of the procedural style call:

---> Example #1 timezone_offset_get() examples

but it is actually an example of the class style call:

---> $timeOffset = $dateTimeZoneJapan->getOffset($dateTimeTaipei);

Reproduce code:
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From manual page: datetimezone.getoffset
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Expected result:
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"... The GMT offset is calculated with the timezone information contained in the DateTimeZone object being used."

Actual result:
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"... The GMT offset is calculated with the timezone information contained in the DateTime object being used."