Ambrosite Next/Previous Post Link Plus for WordPress

IMPORTANT: Make sure you are using the right plugin.

Next/Previous Post Link Plus is intended for use in single post templates.

Next/Previous Page Link Plus is intended for use in page templates.

The two plugins have similar sounding, but different, function names. If you mistakenly install the wrong plugin, you will get a “call to undefined function” error. If you want to create next/previous links for your pages, please check out:

https://wordpress.org/extend/plugins/ambrosite-nextprevious-page-link-plus/

IMPORTANT: This plugin is not compatible with PHP 4. If you try to install it on a host running PHP 4, you will get a parse error. WordPress has officially ended support for PHP 4 as of version 3.2, so you should upgrade to PHP 5.2 now. For those who cannot upgrade, you can download the alternate PHP 4 compatible version of the plugin. The only difference with the PHP 4 version is that the %category variable will not work with custom taxonomies.

http://www.ambrosite.com/download/ambrosite-nextprevious-post-link-plus.php4.zip

This plugin creates two new template tags — next_post_link_plus and previous_post_link_plus — which are upgraded versions of the core WordPress next_post_link and previous_post_link template tags. The new tags include all of the functionality of the core tags, plus the following additional options:

Sort the next/previous post links on columns other than post_date (e.g. alphabetically).

Sort next/previous links on custom fields (both string and integer sorts are supported).

Full WordPress 3.3 compatibility, including support for custom post types, custom taxonomies, and post formats.