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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 |
|---|---|
| 689 | * |
| 690 | * @since 2.8.0 |
| 691 | * |
| 692 | * @see set_screen_options() |
| 693 | * |
| 694 | * @param bool $keep Whether to save or skip saving the screen option value. Default false. |
| 695 | * @param string $option The option name. |
| 696 | * @param int $value The number of rows to use. |
| 697 | */ |
| 698 | $value = apply_filters( 'set-screen-option', false, $option, $value ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores |
| 699 | |
| 700 | if ( false === $value ) { |
| 701 | return; |
| 702 | } |
| 703 | break; |
| 704 | } |
| 705 | |
| 706 | update_user_meta( $user->ID, $option, $value ); |
| 707 | |