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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 |
---|---|
617 | * |
618 | * The dynamic portion of the hook name, `$post_type`, refers to the post |
619 | * type slug. |
620 | * |
621 | * @since 3.5.0 |
622 | * |
623 | * @param string[] $taxonomies Array of taxonomy names to show columns for. |
624 | * @param string $post_type The post type. |
625 | */ |
626 | $taxonomies = apply_filters( "manage_taxonomies_for_{$post_type}_columns", $taxonomies, $post_type ); |
627 | $taxonomies = array_filter( $taxonomies, 'taxonomy_exists' ); |
628 |
|
629 | foreach ( $taxonomies as $taxonomy ) { |
630 | if ( 'category' === $taxonomy ) { |
631 | $column_key = 'categories'; |
632 | } elseif ( 'post_tag' === $taxonomy ) { |
633 | $column_key = 'tags'; |
634 | } else { |
635 | $column_key = 'taxonomy-' . $taxonomy; |