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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 |
|---|---|
| 1859 | } |
| 1860 | |
| 1861 | function screen_layout($screen) { |
| 1862 | global $screen_layout_columns, $wp_current_screen_options; |
| 1863 | |
| 1864 | if ( is_string($screen) ) |
| 1865 | $screen = convert_to_screen($screen); |
| 1866 | |
| 1867 | // Back compat for plugins using the filter instead of add_screen_option() |
| 1868 | $columns = apply_filters('screen_layout_columns', array(), $screen->id, $screen); |
| 1869 | if ( !empty($columns) && isset($columns[$screen->id]) ) |
| 1870 | add_screen_option('layout_columns', array('max' => $columns[$screen->id]) ); |
| 1871 | |
| 1872 | if ( !isset($wp_current_screen_options['layout_columns']) ) { |
| 1873 | $screen_layout_columns = 0; |
| 1874 | return ''; |
| 1875 | } |
| 1876 | |
| 1877 | $screen_layout_columns = get_user_option("screen_layout_$screen->id"); |