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dethron wrote:what is get_footer() ? it is not a built-in function while include is a standard function.
You are right, get_footer() is not a built-in function. However, it is defined as part of Wordpress.
From everything I've read on the wordpress wiki the only difference between using the built-in include function and the wordpress include tags is that the wordpress include tags include specific files whereas with include you have to pass an argument with the file name. You may want to reference the Wordpress Codex Wiki to make sure.