Preserve custom URL parameter on more pages

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I created a custom URL parameter for sorting posts by their vote scores. I have a “most voted” link that sends a ?sort=most_voted URL paramater and using a query posts filter I display posts with most votes.

If for instance I want to display most voted posts in category 5, I’ll need a URL like this ?cat=5&sort=most_votes

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How do I preserve/attach the sort parameter in the URL when browsing categories (or even by tag name, search, etc)?

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2 comments

  1. You will need to intercept the links generated by WordPress and append the query var onto the relevant URLs.

    You can do this quite easily with a filter on category URLs with something like…

    function add_my_query_var( $link ) {
    $link = add_query_arg( 'sort', 'most_voted', $link );
    return $link;
}
add_filter('category_link','add_my_query_var');

    I also spotted this handy list of filters on Mike’s post on SO, it should cover all the possible URLs you’d want to tweak the query vars for…

    add_filter('page_link','add_my_query_var');
add_filter('post_link','add_my_query_var');
add_filter('term_link','add_my_query_var');
add_filter('tag_link','add_my_query_var');
add_filter('category_link','add_my_query_var');
add_filter('post_type_link','add_my_query_var');
add_filter('attachment_link','add_my_query_var');
add_filter('year_link','add_my_query_var');
add_filter('month_link','add_my_query_var');
add_filter('day_link','add_my_query_var');
add_filter('search_link','add_my_query_var');

add_filter('feed_link','add_my_query_var');
add_filter('post_comments_feed_link','add_my_query_var');
add_filter('author_feed_link','add_my_query_var');
add_filter('category_feed_link','add_my_query_var');
add_filter('taxonomy_feed_link','add_my_query_var');
add_filter('search_feed_link','add_my_query_var');

add_filter('get_edit_tag_link','add_my_query_var');
add_filter('get_edit_post_link','add_my_query_var');
add_filter('get_delete_post_link','add_my_query_var');
add_filter('get_edit_comment_link','add_my_query_var');
add_filter('get_edit_bookmark_link','add_my_query_var');

add_filter('index_rel_link','add_my_query_var');
add_filter('parent_post_rel_link','add_my_query_var');
add_filter('previous_post_rel_link','add_my_query_var');
add_filter('next_post_rel_link','add_my_query_var');
add_filter('start_post_rel_link','add_my_query_var');
add_filter('end_post_rel_link','add_my_query_var');

add_filter('previous_post_link','add_my_query_var');
add_filter('next_post_link','add_my_query_var');

add_filter('get_pagenum_link','add_my_query_var');
add_filter('get_comments_pagenum_link','add_my_query_var');
add_filter('shortcut_link','add_my_query_var');
add_filter('get_shortlink','add_my_query_var');

add_filter('home_url','add_my_query_var');
add_filter('site_url','add_my_query_var');
add_filter('admin_url','add_my_query_var');
add_filter('includes_url','add_my_query_var');
add_filter('content_url','add_my_query_var');
add_filter('plugins_url','add_my_query_var');

add_filter('network_site_url','add_my_query_var');
add_filter('network_home_url','add_my_query_var');
add_filter('network_admin_url','add_my_query_var');

    Hope that helps..