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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 |
|---|---|
| 1246 | |
| 1247 | /** |
| 1248 | * Filters the post types that have different view mode options. |
| 1249 | * |
| 1250 | * @since 4.4.0 |
| 1251 | * |
| 1252 | * @param string[] $view_mode_post_types Array of post types that can change view modes. |
| 1253 | * Default non-hierarchical post types with show_ui on. |
| 1254 | */ |
| 1255 | $view_mode_post_types = apply_filters( 'view_mode_post_types', $view_mode_post_types ); |
| 1256 | |
| 1257 | if ( ! in_array( $this->post_type, $view_mode_post_types ) ) { |
| 1258 | return; |
| 1259 | } |
| 1260 | |
| 1261 | global $mode; |
| 1262 | |
| 1263 | // This needs a submit button |
| 1264 | add_filter( 'screen_options_show_submit', '__return_true' ); |