How to use get_adjacent_post_join filter in WordPress

The dynamic portion of the hook name, $adjacent, refers to the type of adjacency, either ‘next’ or ‘previous’. To use the get_adjacent_post_join filter, first, you have to register it using add_filter. We at WePlugins suggest creating a custom WordPress Plugin for using hooks to ensure no disruptions during theme updates.

Live Example 1: Basic Usage

Here’s a basic example of how to use the get_adjacent_post_join filter:

    function weplugins_modify_get_adjacent_post_join_defaults($join, $in_same_term, $excluded_terms, $taxonomy, $post) { 
        // Update the $join variable according to your website requirements and return this variable.
        return $join; 
    }
    // add the filter
    add_filter( "get_adjacent_post_join", "weplugins_modify_get_adjacent_post_join_defaults", 10, 5 );
    

Live Example 2: Removing a Hook

Sometimes, you need to remove a registered hook. Use remove_filter as demonstrated below:

    remove_filter( "get_adjacent_post_join", "weplugins_modify_get_adjacent_post_join_defaults", 10, 5 );
    

Ensure to provide the same callback function name, priority, and number of arguments when removing the hook callback.

Live Example 3: Conditional Modification

You can also modify the $join variable conditionally based on your requirements:

    function weplugins_conditional_get_adjacent_post_join($join, $in_same_term, $excluded_terms, $taxonomy, $post) { 
        if ($taxonomy == 'category') {
            // Modify join clause if taxonomy is category
            $join .= " /* Custom join modification */ ";
        }
        return $join;
    }
    add_filter( "get_adjacent_post_join", "weplugins_conditional_get_adjacent_post_join", 10, 5 );
    

If you’re facing any issues or need customization, feel free to Contact Us.