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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 |
|---|---|
| 556 | * |
| 557 | * The dynamic portion of the hook name, `$post_type`, refers to the post |
| 558 | * type slug. |
| 559 | * |
| 560 | * @since 3.5.0 |
| 561 | * |
| 562 | * @param string[] $taxonomies Array of taxonomy names to show columns for. |
| 563 | * @param string $post_type The post type. |
| 564 | */ |
| 565 | $taxonomies = apply_filters( "manage_taxonomies_for_{$post_type}_columns", $taxonomies, $post_type ); |
| 566 | $taxonomies = array_filter( $taxonomies, 'taxonomy_exists' ); |
| 567 | |
| 568 | foreach ( $taxonomies as $taxonomy ) { |
| 569 | if ( 'category' === $taxonomy ) { |
| 570 | $column_key = 'categories'; |
| 571 | } elseif ( 'post_tag' === $taxonomy ) { |
| 572 | $column_key = 'tags'; |
| 573 | } else { |
| 574 | $column_key = 'taxonomy-' . $taxonomy; |