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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 |
|---|---|
| 1182 | * Filters the HTML output of a list of pages as a drop down. |
| 1183 | * |
| 1184 | * @since 2.1.0 |
| 1185 | * @since 4.4.0 `$r` and `$pages` added as arguments. |
| 1186 | * |
| 1187 | * @param string $output HTML output for drop down list of pages. |
| 1188 | * @param array $r The parsed arguments array. |
| 1189 | * @param array $pages List of WP_Post objects returned by `get_pages()` |
| 1190 | */ |
| 1191 | $html = apply_filters( 'wp_dropdown_pages', $output, $r, $pages ); |
| 1192 | |
| 1193 | if ( $r['echo'] ) { |
| 1194 | echo $html; |
| 1195 | } |
| 1196 | return $html; |
| 1197 | } |
| 1198 | |
| 1199 | /** |
| 1200 | * Retrieve or display a list of pages (or hierarchical post type items) in list (li) format. |