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7-add-new-taxonomy-filter.php
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<?php | |
add_action( 'restrict_manage_posts', 'filter_posts_by_topics', 10, 2 ); | |
function filter_posts_by_topics( $post_type, $which ) { | |
/* Apply this only on a specific post type */ | |
if ( 'post' !== $post_type ) { | |
return; | |
} | |
/* A list of taxonomy slugs to filter by */ | |
$taxonomies = array( 'topics' ); | |
foreach ( $taxonomies as $taxonomy_slug ) { | |
$taxonomy_obj = get_taxonomy( $taxonomy_slug ); /* Retrieve taxonomy data */ | |
$taxonomy_name = $taxonomy_obj->labels->name; | |
$terms = get_terms( array( | |
'taxonomy' => 'topics', | |
'hide_empty' => false, | |
) ); /* Retrieve taxonomy terms */ | |
/* Display filter HTML */ | |
echo '<select name="{$taxonomy_slug}" id="{$taxonomy_slug}" class="postform">'; | |
echo '<option value="">' . sprintf( esc_attr__( 'Show All %s', 'text_domain' ), esc_attr( $taxonomy_name ) ) . '</option>'; | |
foreach ( $terms as $term ) { | |
printf( | |
'<option value="%1$s" %2$s>%3$s (%4$s)</option>', | |
esc_attr( $term->slug ), | |
( ( isset( $_GET[$taxonomy_slug] ) && ( $_GET[$taxonomy_slug] === $term->slug ) ) ? ' selected="selected"' : '' ), | |
esc_attr( $term->name ), | |
esc_attr( $term->count ) | |
); | |
} | |
echo '</select>'; | |
} | |
} |
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