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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 259 | |
| 260 | if ( post_type_supports( $post_type, 'author' ) ) |
| 261 | $posts_columns['author'] = __( 'Author' ); |
| 262 | |
| 263 | $taxonomies = array(); |
| 264 | |
| 265 | $taxonomies = get_object_taxonomies( $post_type, 'objects' ); |
| 266 | $taxonomies = wp_filter_object_list( $taxonomies, array( 'show_admin_column' => true ), 'and', 'name' ); |
| 267 | |
| 268 | $taxonomies = apply_filters( "manage_taxonomies_for_{$post_type}_columns", $taxonomies, $post_type ); |
| 269 | $taxonomies = array_filter( $taxonomies, 'taxonomy_exists' ); |
| 270 | |
| 271 | foreach ( $taxonomies as $taxonomy ) { |
| 272 | if ( 'category' == $taxonomy ) |
| 273 | $column_key = 'categories'; |
| 274 | elseif ( 'post_tag' == $taxonomy ) |
| 275 | $column_key = 'tags'; |
| 276 | else |
| 277 | $column_key = 'taxonomy-' . $taxonomy; |