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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 5 times in this file.
| Line | Code |
|---|---|
| 336 | $class = esc_attr( $class ); |
| 337 | $id = $id ? esc_attr( $id ) : $name; |
| 338 | |
| 339 | if ( ! $r['hide_if_empty'] || ! empty($categories) ) |
| 340 | $output = "<select name='$name' id='$id' class='$class' $tab_index_attribute>\n"; |
| 341 | else |
| 342 | $output = ''; |
| 343 | |
| 344 | if ( empty($categories) && ! $r['hide_if_empty'] && !empty($show_option_none) ) { |
| 345 | $show_option_none = apply_filters( 'list_cats', $show_option_none ); |
| 346 | $output .= "\t<option value='-1' selected='selected'>$show_option_none</option>\n"; |
| 347 | } |
| 348 | |
| 349 | if ( ! empty( $categories ) ) { |
| 350 | |
| 351 | if ( $show_option_all ) { |
| 352 | $show_option_all = apply_filters( 'list_cats', $show_option_all ); |
| 353 | $selected = ( '0' === strval($r['selected']) ) ? " selected='selected'" : ''; |
| 354 | $output .= "\t<option value='0'$selected>$show_option_all</option>\n"; |
| 355 | } |
| 356 | |
| 357 | if ( $show_option_none ) { |
| 358 | $show_option_none = apply_filters( 'list_cats', $show_option_none ); |
| 359 | $selected = ( '-1' === strval($r['selected']) ) ? " selected='selected'" : ''; |
| 360 | $output .= "\t<option value='-1'$selected>$show_option_none</option>\n"; |
| 361 | } |
| 362 | |
| 363 | if ( $hierarchical ) |
| 364 | $depth = $r['depth']; // Walk the full depth. |
| 365 | else |
| 366 | $depth = -1; // Flat. |
| 367 | |
| Line | Code |
| 835 | * @param object $category Category data object. |
| 836 | * @param int $depth Depth of category in reference to parents. Default 0. |
| 837 | * @param array $args An array of arguments. @see wp_list_categories() |
| 838 | * @param int $id ID of the current category. |
| 839 | */ |
| 840 | function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) { |
| 841 | extract($args); |
| 842 | |
| 843 | $cat_name = esc_attr( $category->name ); |
| 844 | $cat_name = apply_filters( 'list_cats', $cat_name, $category ); |
| 845 | $link = '<a href="' . esc_url( get_term_link($category) ) . '" '; |
| 846 | if ( $use_desc_for_title == 0 || empty($category->description) ) |
| 847 | $link .= 'title="' . esc_attr( sprintf(__( 'View all posts filed under %s' ), $cat_name) ) . '"'; |
| 848 | else |
| 849 | $link .= 'title="' . esc_attr( strip_tags( apply_filters( 'category_description', $category->description, $category ) ) ) . '"'; |
| 850 | $link .= '>'; |
| 851 | $link .= $cat_name . '</a>'; |
| 852 | |
| 853 | if ( !empty($feed_image) || !empty($feed) ) { |
| Line | Code |
| 952 | * |
| 953 | * @param string $output Passed by reference. Used to append additional content. |
| 954 | * @param object $category Category data object. |
| 955 | * @param int $depth Depth of category. Used for padding. |
| 956 | * @param array $args Uses 'selected' and 'show_count' keys, if they exist. @see wp_dropdown_categories() |
| 957 | */ |
| 958 | function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) { |
| 959 | $pad = str_repeat(' ', $depth * 3); |
| 960 | |
| 961 | $cat_name = apply_filters('list_cats', $category->name, $category); |
| 962 | $output .= "\t<option class=\"level-$depth\" value=\"".$category->term_id."\""; |
| 963 | if ( $category->term_id == $args['selected'] ) |
| 964 | $output .= ' selected="selected"'; |
| 965 | $output .= '>'; |
| 966 | $output .= $pad.$cat_name; |
| 967 | if ( $args['show_count'] ) |
| 968 | $output .= ' ('. $category->count .')'; |
| 969 | $output .= "</option>\n"; |
| 970 | } |