CodeIgniter - Which function to use for URL's -

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im building first application using codeigniter, need bit of advice.

there 2 functions same thing , wondering best use.

ok, when im building site, link homepage simple / if building on directory, take root public_html directory, codeigniter have found both

site_url()

and

base_url()

but, both seem same thing .. wondering if theres difference, 1 better use, etc etc.

cheers,

if using index.php 

 site_url()

will include index.php , and

 base_url()

will not include it.

if creating url pass, use 

 site_url('images/img.png')

otherwise...

 base_url().'images/img.png'

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