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wp_old_slug_redirect

Redirect old slugs to the correct permalink.

the_comment

Iterate comment index in the comment loop.

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have_comments

Whether there are comments to loop over.

the_post

Iterate the post index in the loop.

in_the_loop

Determines whether the caller is in the Loop.

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is_main_query

Determines whether the query is the main query.

have_posts

Whether current WordPress query has results to loop over.

is_embed

Is the query for an embedded post?