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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 |
---|---|
372 | if ( $hierarchical ) |
373 | $depth = $r['depth']; // Walk the full depth. |
374 | else |
375 | $depth = -1; // Flat. |
376 |
|
377 | $output .= walk_category_dropdown_tree( $categories, $depth, $r ); |
378 | $output .= "</select>\n"; |
379 | } |
380 |
|
381 | $output = apply_filters( 'wp_dropdown_cats', $output ); |
382 |
|
383 | if ( $echo ) |
384 | echo $output; |
385 |
|
386 | return $output; |
387 | } |
388 |
|
389 | /** |
390 | * Display or retrieve the HTML list of categories. |