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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 |
|---|---|
| 1210 | * Filters the HTML output of a list of pages as a drop down. |
| 1211 | * |
| 1212 | * @since 2.1.0 |
| 1213 | * @since 4.4.0 `$r` and `$pages` added as arguments. |
| 1214 | * |
| 1215 | * @param string $output HTML output for drop down list of pages. |
| 1216 | * @param array $r The parsed arguments array. |
| 1217 | * @param array $pages List of WP_Post objects returned by `get_pages()` |
| 1218 | */ |
| 1219 | $html = apply_filters( 'wp_dropdown_pages', $output, $r, $pages ); |
| 1220 | |
| 1221 | if ( $r['echo'] ) { |
| 1222 | echo $html; |
| 1223 | } |
| 1224 | return $html; |
| 1225 | } |
| 1226 | |
| 1227 | /** |
| 1228 | * Retrieve or display a list of pages (or hierarchical post type items) in list (li) format. |