How to convert all links to no follow links of particlular section of a webpage

Question

I just wanna convert all links to no follow links which are being displayed in sidebar or footer or comments.

How can i do this?

Answer 1

wp_rel_nofollow() does this for you. It is already called on pre_comment_content, so comments should be covered. For sidebars and footers, this depends on the widgets and other code you use there, but it should be possible to call that function there too.