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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 |
|---|---|
| 426 | |
| 427 | /** |
| 428 | * Filters whether to remove the 'Categories' drop-down from the post list table. |
| 429 | * |
| 430 | * @since 4.6.0 |
| 431 | * |
| 432 | * @param bool $disable Whether to disable the categories drop-down. Default false. |
| 433 | * @param string $post_type Post type slug. |
| 434 | */ |
| 435 | if ( false !== apply_filters( 'disable_categories_dropdown', false, $post_type ) ) { |
| 436 | return; |
| 437 | } |
| 438 | |
| 439 | if ( is_object_in_taxonomy( $post_type, 'category' ) ) { |
| 440 | $dropdown_options = array( |
| 441 | 'show_option_all' => get_taxonomy( 'category' )->labels->all_items, |
| 442 | 'hide_empty' => 0, |
| 443 | 'hierarchical' => 1, |
| 444 | 'show_count' => 0, |