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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 |
---|---|
437 | } |
438 | /** |
439 | * Filters the taxonomy drop-down output. |
440 | * |
441 | * @since 2.1.0 |
442 | * |
443 | * @param string $output HTML output. |
444 | * @param array $r Arguments used to build the drop-down. |
445 | */ |
446 | $output = apply_filters( 'wp_dropdown_cats', $output, $r ); |
447 |
|
448 | if ( $r['echo'] ) { |
449 | echo $output; |
450 | } |
451 | return $output; |
452 | } |
453 |
|
454 | /** |
455 | * Display or retrieve the HTML list of categories. |