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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 |
|---|---|
| 845 | endforeach; |
| 846 | ?> |
| 847 | </div> |
| 848 | </div> |
| 849 | </div> |
| 850 | <?php |
| 851 | // Setup layout columns |
| 852 | |
| 853 | // Back compat for plugins using the filter instead of add_screen_option() |
| 854 | $columns = apply_filters( 'screen_layout_columns', array(), $this->id, $this ); |
| 855 | |
| 856 | if ( ! empty( $columns ) && isset( $columns[ $this->id ] ) ) |
| 857 | $this->add_option( 'layout_columns', array('max' => $columns[ $this->id ] ) ); |
| 858 | |
| 859 | if ( $this->get_option( 'layout_columns' ) ) { |
| 860 | $this->columns = (int) get_user_option("screen_layout_$this->id"); |
| 861 | |
| 862 | if ( ! $this->columns && $this->get_option( 'layout_columns', 'default' ) ) |
| 863 | $this->columns = $this->get_option( 'layout_columns', 'default' ); |