Add filter-by-tag in the all posts admin console page

2 comments

1. User 'restrict_manage_posts' filter to add another filter. Use the following code in functions.php

   function kc_add_taxonomy_filters() {
   global $typenow;
   
   // an array of all the taxonomyies you want to display. Use the taxonomy name or slug
   $my_taxonomies = array(  'post_tag' );
   switch($typenow){
   
       case 'post':
   
           foreach ($my_taxonomies as $tax_slug) {
   
   
                       $tax_obj = get_taxonomy($tax_slug);
                       $tax_name = $tax_obj->labels->name;
                       $terms = get_terms($tax_slug);
                       if(count($terms) > 0) {
                           echo "<select name='$tax_slug' id='$tax_slug' class='postform alignleft actions'>";
                           echo "<option value=''>Show All $tax_name</option>";
                           foreach ($terms as $term) {
                               echo '<option value="', $term->slug,'" ',selected( @$_GET[$tax_slug] == $term->slug , $current = true, $echo = false ) , '>' , $term->name ,' (' , $term->count ,')</option>';
                           }
                           echo "</select>";
                       }
   
           }
   
   
       break;
   }
   }
   add_action( 'restrict_manage_posts', 'kc_add_taxonomy_filters' );
   

2. With absolutely no help whatsoever from this community and it’s ridiculous reputation rules, I have worked out how to amend the above code so that it works properly.

   The following code needs to go into wp-includes/functions.php. Notice that I have hardcoded the select name to be tag, which appears to be how the WP filter query string works now.

   function kc_add_taxonomy_filters() {
   global $typenow;
   
   // an array of all the taxonomyies you want to display. Use the taxonomy name or slug
   $my_taxonomies = array(  'post_tag' );
   switch($typenow){
   
       case 'post':
   
           foreach ($my_taxonomies as $tax_slug) {
   
   
                       $tax_obj = get_taxonomy($tax_slug);
                       $tax_name = $tax_obj->labels->name;
                       $terms = get_terms($tax_slug);
                       if(count($terms) > 0) {
                           echo "<select name='tag' id='$tax_slug' class='postform alignleft actions'>";
                           echo "<option value=''>Show All $tax_name</option>";
                           foreach ($terms as $term) {
                               echo '<option value="', $term->slug,'" ',selected( @$_GET[$tax_slug] == $term->slug , $current = true, $echo = false ) , '>' , $term->name ,' (' , $term->count ,')</option>';
                           }
                           echo "</select>";
                       }
   
           }
   
   
       break;
   }
   }  
   

   Then the action needs to go into your theme functions.php file (wp-content/themes/YOURTHEME/functions.php

   add_action( 'restrict_manage_posts', 'kc_add_taxonomy_filters' );
   

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