re calling a function without including file

Posted on 16th Feb 2014 07:03 pm by admin

Hi,
i am new to programming in php, i was just checking the wordpress code and found out in the wordpress code they are calling the function get_header(); at the top of every page but above calling this function their is no file included file, how is it possible, how can a function work without function defination.

Please recommend
Regards

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