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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 |
|---|---|
| 895 | * This hook provides back-compat for plugins using the back-compat |
| 896 | * Filters instead of add_screen_option(). |
| 897 | * |
| 898 | * @since 2.8.0 |
| 899 | * |
| 900 | * @param array $empty_columns Empty array. |
| 901 | * @param string $screen_id Screen ID. |
| 902 | * @param WP_Screen $this Current WP_Screen instance. |
| 903 | */ |
| 904 | $columns = apply_filters( 'screen_layout_columns', array(), $this->id, $this ); |
| 905 | |
| 906 | if ( ! empty( $columns ) && isset( $columns[ $this->id ] ) ) { |
| 907 | $this->add_option( 'layout_columns', array( 'max' => $columns[ $this->id ] ) ); |
| 908 | } |
| 909 | |
| 910 | if ( $this->get_option( 'layout_columns' ) ) { |
| 911 | $this->columns = (int) get_user_option( "screen_layout_$this->id" ); |
| 912 | |
| 913 | if ( ! $this->columns && $this->get_option( 'layout_columns', 'default' ) ) { |