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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 |
---|---|
777 | $output = "<select name=\"$name\" id=\"$id\">\n"; |
778 | if ( $show_option_no_change ) |
779 | $output .= "\t<option value=\"-1\">$show_option_no_change</option>"; |
780 | if ( $show_option_none ) |
781 | $output .= "\t<option value=\"" . esc_attr($option_none_value) . "\">$show_option_none</option>\n"; |
782 | $output .= walk_page_dropdown_tree($pages, $depth, $r); |
783 | $output .= "</select>\n"; |
784 | } |
785 |
|
786 | $output = apply_filters('wp_dropdown_pages', $output); |
787 |
|
788 | if ( $echo ) |
789 | echo $output; |
790 |
|
791 | return $output; |
792 | } |
793 |
|
794 | /** |
795 | * Retrieve or display list of pages in list (li) format. |