date_default_timezone_set（）会影响time（）吗？

Question

If I set a time zone like:

date_default_timezone_set('America/Los_Angeles');

Will it affect the value of time()?

Answer 1

I don't believe so

Returns the current time measured in the number of seconds since the Unix Epoch (January 1 1970 00:00:00 GMT).

Note the GMT on the end.

Also read the first comment on the php.net for time()

The documentation should have this info. The function time() returns always timestamp that is timezone independent (=UTC).

<?php 
date_default_timezone_set("UTC"); 
echo "UTC:".time(); 
echo "<br>"; 

date_default_timezone_set("Europe/Helsinki"); 
echo "Europe/Helsinki:".time(); 
echo "<br>"; 
?> 

Local time as string can be get by strftime() and local timestamp (if ever needed) by mktime().