Description:
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It would be nice to make localtime() to use the current time as a default if the passed time argument is NULL.
Reason: It makes a lot of extra work if the localtime call is called with an optional timestamp parameter passed from outside

Test script:
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localtime(is_null($iTime) ? time() : $iTime)

should be shorter:

localtime($iTime)

where time is a timestamp or null for the current time. At the moment NULL is interpreted as 0 which is not what (at least) I expect.