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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 |
|---|---|
| 1820 | } |
| 1821 | |
| 1822 | function screen_layout($screen) { |
| 1823 | global $screen_layout_columns, $wp_current_screen_options; |
| 1824 | |
| 1825 | if ( is_string($screen) ) |
| 1826 | $screen = convert_to_screen($screen); |
| 1827 | |
| 1828 | // Back compat for plugins using the filter instead of add_screen_option() |
| 1829 | $columns = apply_filters('screen_layout_columns', array(), $screen->id, $screen); |
| 1830 | if ( !empty($columns) && isset($columns[$screen->id]) ) |
| 1831 | add_screen_option('layout_columns', array('max' => $columns[$screen->id]) ); |
| 1832 | |
| 1833 | if ( !isset($wp_current_screen_options['layout_columns']) ) { |
| 1834 | $screen_layout_columns = 0; |
| 1835 | return ''; |
| 1836 | } |
| 1837 | |
| 1838 | $screen_layout_columns = get_user_option("screen_layout_$screen->id"); |