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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. |