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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 |
|---|---|
| 1207 | |
| 1208 | /** |
| 1209 | * Filter the post types that have different view mode options. |
| 1210 | * |
| 1211 | * @since 4.4.0 |
| 1212 | * |
| 1213 | * @param array $view_mode_post_types Array of post types that can change view modes. |
| 1214 | * Default hierarchical post types with show_ui on. |
| 1215 | */ |
| 1216 | $view_mode_post_types = apply_filters( 'view_mode_post_types', $view_mode_post_types ); |
| 1217 | |
| 1218 | if ( ! in_array( $this->post_type, $view_mode_post_types ) ) { |
| 1219 | return; |
| 1220 | } |
| 1221 | |
| 1222 | global $mode; |
| 1223 | |
| 1224 | // This needs a submit button |
| 1225 | add_filter( 'screen_options_show_submit', '__return_true' ); |