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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 359 | $categories = get_categories( $r ); |
| 360 | $name = esc_attr($name); |
| 361 | $class = esc_attr($class); |
| 362 | |
| 363 | $output = ''; |
| 364 | if ( ! empty( $categories ) ) { |
| 365 | $output = "<select name='$name' id='$name' class='$class' $tab_index_attribute>\n"; |
| 366 | |
| 367 | if ( $show_option_all ) { |
| 368 | $show_option_all = apply_filters( 'list_cats', $show_option_all ); |
| 369 | $selected = ( '0' === strval($r['selected']) ) ? " selected='selected'" : ''; |
| 370 | $output .= "\t<option value='0'$selected>$show_option_all</option>\n"; |
| 371 | } |
| 372 | |
| 373 | if ( $show_option_none ) { |
| 374 | $show_option_none = apply_filters( 'list_cats', $show_option_none ); |
| 375 | $selected = ( '-1' === strval($r['selected']) ) ? " selected='selected'" : ''; |
| 376 | $output .= "\t<option value='-1'$selected>$show_option_none</option>\n"; |
| 377 | } |
| 378 | |
| 379 | if ( $hierarchical ) |
| 380 | $depth = $r['depth']; // Walk the full depth. |
| 381 | else |
| 382 | $depth = -1; // Flat. |
| 383 | |