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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 |
|---|---|
| 801 | * Filters the arguments used to generate a Pages drop-down element. |
| 802 | * |
| 803 | * @since 3.3.0 |
| 804 | * |
| 805 | * @see wp_dropdown_pages() |
| 806 | * |
| 807 | * @param array $dropdown_args Array of arguments used to generate the pages drop-down. |
| 808 | * @param WP_Post $post The current WP_Post object. |
| 809 | */ |
| 810 | $dropdown_args = apply_filters( 'page_attributes_dropdown_pages_args', $dropdown_args, $post ); |
| 811 | $pages = wp_dropdown_pages( $dropdown_args ); |
| 812 | if ( ! empty($pages) ) { |
| 813 | ?> |
| 814 | <p><strong><?php _e('Parent') ?></strong></p> |
| 815 | <label class="screen-reader-text" for="parent_id"><?php _e('Parent') ?></label> |
| 816 | <?php echo $pages; ?> |
| 817 | <?php |
| 818 | } // end empty pages check |
| 819 | } // end hierarchical check. |