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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 |
---|---|
516 | * |
517 | * The dynamic portion of the hook name, `$post_type`, refers to the post |
518 | * type slug. |
519 | * |
520 | * @since 3.5.0 |
521 | * |
522 | * @param array $taxonomies Array of taxonomies to show columns for. |
523 | * @param string $post_type The post type. |
524 | */ |
525 | $taxonomies = apply_filters( "manage_taxonomies_for_{$post_type}_columns", $taxonomies, $post_type ); |
526 | $taxonomies = array_filter( $taxonomies, 'taxonomy_exists' ); |
527 |
|
528 | foreach ( $taxonomies as $taxonomy ) { |
529 | if ( 'category' === $taxonomy ) |
530 | $column_key = 'categories'; |
531 | elseif ( 'post_tag' === $taxonomy ) |
532 | $column_key = 'tags'; |
533 | else |
534 | $column_key = 'taxonomy-' . $taxonomy; |