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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 |
---|---|
443 | } |
444 | /** |
445 | * Filter the taxonomy drop-down output. |
446 | * |
447 | * @since 2.1.0 |
448 | * |
449 | * @param string $output HTML output. |
450 | * @param array $r Arguments used to build the drop-down. |
451 | */ |
452 | $output = apply_filters( 'wp_dropdown_cats', $output, $r ); |
453 |
|
454 | if ( $r['echo'] ) { |
455 | echo $output; |
456 | } |
457 | return $output; |
458 | } |
459 |
|
460 | /** |
461 | * Display or retrieve the HTML list of categories. |