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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 |
|---|---|
| 415 | } |
| 416 | /** |
| 417 | * Filter the taxonomy drop-down output. |
| 418 | * |
| 419 | * @since 2.1.0 |
| 420 | * |
| 421 | * @param string $output HTML output. |
| 422 | * @param array $r Arguments used to build the drop-down. |
| 423 | */ |
| 424 | $output = apply_filters( 'wp_dropdown_cats', $output, $r ); |
| 425 | |
| 426 | if ( $r['echo'] ) { |
| 427 | echo $output; |
| 428 | } |
| 429 | return $output; |
| 430 | } |
| 431 | |
| 432 | /** |
| 433 | * Display or retrieve the HTML list of categories. |