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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 |
|---|---|
| 729 | $output = "<select name=\"$name\" id=\"$id\">\n"; |
| 730 | if ( $show_option_no_change ) |
| 731 | $output .= "\t<option value=\"-1\">$show_option_no_change</option>"; |
| 732 | if ( $show_option_none ) |
| 733 | $output .= "\t<option value=\"" . esc_attr($option_none_value) . "\">$show_option_none</option>\n"; |
| 734 | $output .= walk_page_dropdown_tree($pages, $depth, $r); |
| 735 | $output .= "</select>\n"; |
| 736 | } |
| 737 | |
| 738 | $output = apply_filters('wp_dropdown_pages', $output); |
| 739 | |
| 740 | if ( $echo ) |
| 741 | echo $output; |
| 742 | |
| 743 | return $output; |
| 744 | } |
| 745 | |
| 746 | /** |
| 747 | * Retrieve or display list of pages in list (li) format. |