Display posts containing at least 1 from a list of say 10 tags but not containing other tags

Question

Difficult to explain and maybe totally impossible but I have say 30 tags in total. I would like to output all posts that contain at least one from a list of say 10 tags but do not contain any of the other 20.

So for example (assuming I'm targeting posts exclusively containing any number of tags one - ten):

Post containing tags: one three eight ten - would be output Post containing tags: one three eight ten twelve - would not be output

When I say output it could be a list to include in a post or a unique post / page with its own template. The output method I am flexible with - it's targeting the posts I'm not sure can be done? I am only talking about the tag taxonomy - no other variables.

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Update 16 Jan 2014:

I have created a new template, the relevant parts of which are:

$args = array(
    'post_type' => 'post', 
    'posts_per_page' => 12,
    'paged' => $paged,
    'tag__in' => array (46, 5, 101, 22, 122, 7, 102, 15, 104, 47, 105, 66, 43, 123),
    'tag__not_in' => array (10,121,20,36,23,24,21,76,82,17,6,106,8,75,54,38,57,86,56,95,25,62,16,39,40,69,37,9,42,41,87,73,85)

);

$wp_query = null;
$wp_query = new WP_Query();
$wp_query -> query($args);
?>

<?php if ( $wp_query->have_posts() ) : ?>
<?php while ( $wp_query->have_posts() ) : $wp_query->the_post(); ?>

<?php get_template_part('includes/format', 'archive-update'); ?>

<?php endwhile; ?>
<?php endif; ?>

This works well - the issue is that the tag__in array will be static but the tag__not_in could be dynamic as new tags are added. I would like to automate this array (if that is the correct phrase). To grab the tag ids quickly for tag__not_in I created another template with the following code:

$tags = get_tags('exclude=46,5,101,22,122,7,102,15,104,47,105,66,43,123');

$html = '<div class="post_tags">';
foreach ( $tags as $tag ) {

    $html .= "{$tag->term_id},";
}
$html .= '</div>';
echo $html;

and then copied and pasted the displayed ids manually into the tag__not_in array.

Basically how can I adapt the line:

'tag__not_in' => array (10,121,20,36,23,24,21,76,82,17,6,106,8,75,54,38,57,86,56,95,25,62,16,39,40,69,37,9,42,41,87,73,85)

so that the ids are automatically populated by the array created by get_tags(exclude...). I hope that makes sense.

The output page is http://skipology.com/iphone-photography-articles-10-essential-apps/

Answer 1

Paste this code at the end of your child themes functions.php file.

It will exclude all posts with the comma separated list of tag i.d's from displaying on the home page loop.

add_filter('request', 'filter_tag_loop');
function filter_tag_loop($params) {
$params['tag__not_in'] = array(49);
return $params;
}

Or you could use WP_Query

$query = new WP_Query( array( 'tag__not_in' => array( 46,5,101,22,122,7,102,15,104,47,105,66,43,123 ) ) );

http://codex.wordpress.org/Class_Reference/WP_Query

Or use pre_get_posts (untested)

add_action( 'pre_get_posts', 'wpsites_include_exclude_tagged_posts' );

function wpsites_include_exclude_tagged_posts( $query ) {

if ( $query->is_main_query()  && $query->is_home() ) {

    $query->set( 'tag__in' => array (46, 5, 101, 22, 122, 7, 102, 15, 104, 47, 105, 66, 43, 123)),
    $query->set( 'tag__not_in' => array (10,121,20,36,23,24,21,76,82,17,6,106,8,75,54,38,57,86,56,95,25,62,16,39,40,69,37,9,42,41,87,73,85));
    }
}

http://codex.wordpress.org/Plugin_API/Action_Reference/pre_get_posts