gmmktime and mktime give me the same number

gmmktime and mktime give me the same number

My PHP timezone is 'Asia/Tehran' so I would not expect gmmktime give me
the same result as mktime.
php info:
Default timezone Asia/Tehran
However when I type in my php console:
echo date('jS F Y h:i:s A (T)', mktime());
3rd September 2013 11:23:10 AM (IRDT)
echo date('jS F Y h:i:s A (T)', gmmktime());
3rd September 2013 11:23:16 AM (IRDT)
While I expect 3.5 or 4.5 hours time difference. Am I making a mistake
somewhere?