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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 |
|---|---|
| 405 | * |
| 406 | * The dynamic portion of the hook name, `$post_type`, refers to the post |
| 407 | * type slug. |
| 408 | * |
| 409 | * @since 3.5.0 |
| 410 | * |
| 411 | * @param array $taxonomies Array of taxonomies to show columns for. |
| 412 | * @param string $post_type The post type. |
| 413 | */ |
| 414 | $taxonomies = apply_filters( "manage_taxonomies_for_{$post_type}_columns", $taxonomies, $post_type ); |
| 415 | $taxonomies = array_filter( $taxonomies, 'taxonomy_exists' ); |
| 416 | |
| 417 | foreach ( $taxonomies as $taxonomy ) { |
| 418 | if ( 'category' == $taxonomy ) |
| 419 | $column_key = 'categories'; |
| 420 | elseif ( 'post_tag' == $taxonomy ) |
| 421 | $column_key = 'tags'; |
| 422 | else |
| 423 | $column_key = 'taxonomy-' . $taxonomy; |