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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 |
|---|---|
| 854 | * This hook provides back-compat for plugins using the back-compat |
| 855 | * filter instead of add_screen_option(). |
| 856 | * |
| 857 | * @since 2.8.0 |
| 858 | * |
| 859 | * @param array $empty_columns Empty array. |
| 860 | * @param string $screen_id Screen ID. |
| 861 | * @param WP_Screen $this Current WP_Screen instance. |
| 862 | */ |
| 863 | $columns = apply_filters( 'screen_layout_columns', array(), $this->id, $this ); |
| 864 | |
| 865 | if ( ! empty( $columns ) && isset( $columns[ $this->id ] ) ) |
| 866 | $this->add_option( 'layout_columns', array('max' => $columns[ $this->id ] ) ); |
| 867 | |
| 868 | if ( $this->get_option( 'layout_columns' ) ) { |
| 869 | $this->columns = (int) get_user_option("screen_layout_$this->id"); |
| 870 | |
| 871 | if ( ! $this->columns && $this->get_option( 'layout_columns', 'default' ) ) |
| 872 | $this->columns = $this->get_option( 'layout_columns', 'default' ); |