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To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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 |
|---|---|
| 3701 | if ( is_string($screen) ) |
| 3702 | $screen = convert_to_screen($screen); |
| 3703 | |
| 3704 | $columns = array('dashboard' => 4, 'link' => 2); |
| 3705 | |
| 3706 | // Add custom post types |
| 3707 | foreach ( get_post_types( array('show_ui' => true) ) as $post_type ) |
| 3708 | $columns[$post_type] = 2; |
| 3709 | |
| 3710 | $columns = apply_filters('screen_layout_columns', $columns, $screen->id, $screen); |
| 3711 | |
| 3712 | if ( !isset($columns[$screen->id]) ) { |
| 3713 | $screen_layout_columns = 0; |
| 3714 | return ''; |
| 3715 | } |
| 3716 | |
| 3717 | $screen_layout_columns = get_user_option("screen_layout_$screen->id"); |
| 3718 | $num = $columns[$screen->id]; |
| 3719 | |