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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 |
|---|---|
| 462 | } |
| 463 | /** |
| 464 | * Filter the taxonomy drop-down output. |
| 465 | * |
| 466 | * @since 2.1.0 |
| 467 | * |
| 468 | * @param string $output HTML output. |
| 469 | * @param array $r Arguments used to build the drop-down. |
| 470 | */ |
| 471 | $output = apply_filters( 'wp_dropdown_cats', $output, $r ); |
| 472 | |
| 473 | if ( $r['echo'] ) { |
| 474 | echo $output; |
| 475 | } |
| 476 | return $output; |
| 477 | } |
| 478 | |
| 479 | /** |
| 480 | * Display or retrieve the HTML list of categories. |