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Used on single post permalink pages, this template tag displays a link to the next post which exists in chronological order from the current post.
This tag must be used in The Loop.
<?php next_post_link('format', 'link', 'in_same_cat', 'excluded_categories'); ?>
Displays link with the post title of the next post (chronological post date order), followed by a right angular quote (»).
<?php next_post_link(); ?>
Displays link with next chronological post's title wrapped in 'strong' tags (typically sets text to bold).
<?php next_post_link('<strong>%link</strong>'); ?>
Displays custom text as link to the next post within the same category as the current post. Post title is not included here. "Next post in category" is the custom text, which can be changed to fit your requirements.
<?php next_post_link('%link', 'Next post in category', TRUE); ?>
Displays link to next post in the same category, as long as it is not in category 13 (the category ID #). You can change the number to any category you wish to exclude. Exclude multiple categories by using " and " as a delimiter.
<?php next_post_link('%link', 'Next post in category', TRUE, '13'); ?>
See also previous_post_link().
Pagination: posts_nav_link(), next_posts_link(), previous_posts_link(), get_next_posts_link(), get_previous_posts_link(), paginate_links() wp_link_pages(), next_post_link(), previous_post_link(), next_image_link(), previous_image_link(),