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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 |
---|---|
408 | if ( $hierarchical ) |
409 | $depth = $r['depth']; // Walk the full depth. |
410 | else |
411 | $depth = -1; // Flat. |
412 |
|
413 | $output .= walk_category_dropdown_tree( $categories, $depth, $r ); |
414 | $output .= "</select>\n"; |
415 | } |
416 |
|
417 | $output = apply_filters( 'wp_dropdown_cats', $output ); |
418 |
|
419 | if ( $echo ) |
420 | echo $output; |
421 |
|
422 | return $output; |
423 | } |
424 |
|
425 | /** |
426 | * Display or retrieve the HTML list of categories. |