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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 |
|---|---|
| 632 | * |
| 633 | * The dynamic portion of the hook name, `$post_type`, refers to the post |
| 634 | * type slug. |
| 635 | * |
| 636 | * @since 3.5.0 |
| 637 | * |
| 638 | * @param string[] $taxonomies Array of taxonomy names to show columns for. |
| 639 | * @param string $post_type The post type. |
| 640 | */ |
| 641 | $taxonomies = apply_filters( "manage_taxonomies_for_{$post_type}_columns", $taxonomies, $post_type ); |
| 642 | $taxonomies = array_filter( $taxonomies, 'taxonomy_exists' ); |
| 643 | |
| 644 | foreach ( $taxonomies as $taxonomy ) { |
| 645 | if ( 'category' === $taxonomy ) { |
| 646 | $column_key = 'categories'; |
| 647 | } elseif ( 'post_tag' === $taxonomy ) { |
| 648 | $column_key = 'tags'; |
| 649 | } else { |
| 650 | $column_key = 'taxonomy-' . $taxonomy; |