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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 |
|---|---|
| 477 | * @type string $name Value of the name attribute to use for the drop-down select element. |
| 478 | * Default 'parent'. |
| 479 | * @type string $orderby The field to order by. Default 'name'. |
| 480 | * @type bool $hierarchical Whether the taxonomy is hierarchical. Default true. |
| 481 | * @type string $show_option_none Label to display if there are no terms. Default 'None'. |
| 482 | * } |
| 483 | * @param string $taxonomy The taxonomy slug. |
| 484 | * @param string $context Filter context. Accepts 'new' or 'edit'. |
| 485 | */ |
| 486 | $dropdown_args = apply_filters( 'taxonomy_parent_dropdown_args', $dropdown_args, $taxonomy, 'new' ); |
| 487 | |
| 488 | wp_dropdown_categories( $dropdown_args ); |
| 489 | ?> |
| 490 | <?php if ( 'category' === $taxonomy ) : ?> |
| 491 | <p><?php _e( 'Categories, unlike tags, can have a hierarchy. You might have a Jazz category, and under that have children categories for Bebop and Big Band. Totally optional.' ); ?></p> |
| 492 | <?php else : ?> |
| 493 | <p><?php _e( 'Assign a parent term to create a hierarchy. The term Jazz, for example, would be the parent of Bebop and Big Band.' ); ?></p> |
| 494 | <?php endif; ?> |
| 495 | </div> |