WordPress.org

Template tags (for use in single.php) to create post navigation loop (previous to first post is last post; next/after last post is first post).

The function next_or_loop_post_link() is identical to WordPress's next_post_link() in every way except when called on the last post in the navigation sequence, in which case it links back to the first post in the navigation sequence.

The function previous_or_loop_post_link() is identical to WordPress's previous_post_link() in every way except when called on the first post in the navigation sequence, in which case it links back to the last post in the navigation sequence.

Useful for providing a looping link of posts, such as for a portfolio, or to continually present pertinent posts for visitors to continue reading.

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Author: coffee2code