WP hooks navigation: Home/browse • Actions index • Filters index
To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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.
This hook occurs 3 times in this file.
| Line | Code |
|---|---|
| 373 | $class = esc_attr( $class ); |
| 374 | $id = $id ? esc_attr( $id ) : $name; |
| 375 | |
| 376 | if ( ! $r['hide_if_empty'] || ! empty($categories) ) |
| 377 | $output = "<select name='$name' id='$id' class='$class' $tab_index_attribute>\n"; |
| 378 | else |
| 379 | $output = ''; |
| 380 | |
| 381 | if ( empty($categories) && ! $r['hide_if_empty'] && !empty($show_option_none) ) { |
| 382 | $show_option_none = apply_filters( 'list_cats', $show_option_none ); |
| 383 | $output .= "\t<option value='-1' selected='selected'>$show_option_none</option>\n"; |
| 384 | } |
| 385 | |
| 386 | if ( ! empty( $categories ) ) { |
| 387 | |
| 388 | if ( $show_option_all ) { |
| 389 | $show_option_all = apply_filters( 'list_cats', $show_option_all ); |
| 390 | $selected = ( '0' === strval($r['selected']) ) ? " selected='selected'" : ''; |
| 391 | $output .= "\t<option value='0'$selected>$show_option_all</option>\n"; |
| 392 | } |
| 393 | |
| 394 | if ( $show_option_none ) { |
| 395 | $show_option_none = apply_filters( 'list_cats', $show_option_none ); |
| 396 | $selected = ( '-1' === strval($r['selected']) ) ? " selected='selected'" : ''; |
| 397 | $output .= "\t<option value='-1'$selected>$show_option_none</option>\n"; |
| 398 | } |
| 399 | |
| 400 | if ( $hierarchical ) |
| 401 | $depth = $r['depth']; // Walk the full depth. |
| 402 | else |
| 403 | $depth = -1; // Flat. |
| 404 | |