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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 |
---|---|
1204 | /** |
1205 | * Filter the post types that have different view mode options. |
1206 | * |
1207 | * @since 4.4.0 |
1208 | * |
1209 | * @param array $view_mode_post_types Array of post types that can change view modes. |
1210 | * Default hierarchical post types with show_ui on. |
1211 | */ |
1212 | $view_mode_post_types = get_post_types( array( 'hierarchical' => false, 'show_ui' => true ) ); |
1213 | $view_mode_post_types = apply_filters( 'view_mode_post_types', $view_mode_post_types ); |
1214 |
|
1215 | if ( ! in_array( $this->post_type, $view_mode_post_types ) ) { |
1216 | return; |
1217 | } |
1218 |
|
1219 | global $mode; |
1220 |
|
1221 | // This needs a submit button |
1222 | add_filter( 'screen_options_show_submit', '__return_true' ); |