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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 |
|---|---|
| 799 | $output = "<select name='" . esc_attr( $name ) . "' id='" . esc_attr( $id ) . "'>\n"; |
| 800 | if ( $show_option_no_change ) |
| 801 | $output .= "\t<option value=\"-1\">$show_option_no_change</option>"; |
| 802 | if ( $show_option_none ) |
| 803 | $output .= "\t<option value=\"" . esc_attr($option_none_value) . "\">$show_option_none</option>\n"; |
| 804 | $output .= walk_page_dropdown_tree($pages, $depth, $r); |
| 805 | $output .= "</select>\n"; |
| 806 | } |
| 807 | |
| 808 | $output = apply_filters('wp_dropdown_pages', $output); |
| 809 | |
| 810 | if ( $echo ) |
| 811 | echo $output; |
| 812 | |
| 813 | return $output; |
| 814 | } |
| 815 | |
| 816 | /** |
| 817 | * Retrieve or display list of pages in list (li) format. |