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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 |
|---|---|
| 226 | |
| 227 | /** |
| 228 | * Filter the taxonomy columns for attachments in the Media list table. |
| 229 | * |
| 230 | * @since 3.5.0 |
| 231 | * |
| 232 | * @param array $taxonomies An array of registered taxonomies to show for attachments. |
| 233 | * @param string $post_type The post type. Default 'attachment'. |
| 234 | */ |
| 235 | $taxonomies = apply_filters( 'manage_taxonomies_for_attachment_columns', $taxonomies, 'attachment' ); |
| 236 | $taxonomies = array_filter( $taxonomies, 'taxonomy_exists' ); |
| 237 | |
| 238 | foreach ( $taxonomies as $taxonomy ) { |
| 239 | if ( 'category' == $taxonomy ) |
| 240 | $column_key = 'categories'; |
| 241 | elseif ( 'post_tag' == $taxonomy ) |
| 242 | $column_key = 'tags'; |
| 243 | else |
| 244 | $column_key = 'taxonomy-' . $taxonomy; |