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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 |
---|---|
1221 |
|
1222 | /** |
1223 | * Filters the post types that have different view mode options. |
1224 | * |
1225 | * @since 4.4.0 |
1226 | * |
1227 | * @param array $view_mode_post_types Array of post types that can change view modes. |
1228 | * Default non-hierarchical post types with show_ui on. |
1229 | */ |
1230 | $view_mode_post_types = apply_filters( 'view_mode_post_types', $view_mode_post_types ); |
1231 |
|
1232 | if ( ! in_array( $this->post_type, $view_mode_post_types ) ) { |
1233 | return; |
1234 | } |
1235 |
|
1236 | global $mode; |
1237 |
|
1238 | // This needs a submit button |
1239 | add_filter( 'screen_options_show_submit', '__return_true' ); |