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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 |
|---|---|
| 855 | /** |
| 856 | * Render the option for number of columns on the page |
| 857 | * |
| 858 | * @since 3.3.0 |
| 859 | */ |
| 860 | function render_screen_layout() { |
| 861 | global $screen_layout_columns; |
| 862 | |
| 863 | // Back compat for plugins using the filter instead of add_screen_option() |
| 864 | $columns = apply_filters( 'screen_layout_columns', array(), $this->id, $this ); |
| 865 | |
| 866 | if ( ! empty( $columns ) && isset( $columns[ $this->id ] ) ) |
| 867 | $this->add_option( 'layout_columns', array('max' => $columns[ $this->id ] ) ); |
| 868 | |
| 869 | if ( ! $this->get_option('layout_columns') ) { |
| 870 | $screen_layout_columns = 0; |
| 871 | return; |
| 872 | } |
| 873 | |