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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 |
|---|---|
| 474 | /** |
| 475 | * Fires immediately before an option value is updated. |
| 476 | * |
| 477 | * @since 2.9.0 |
| 478 | * |
| 479 | * @param string $option Name of the option to update. |
| 480 | * @param mixed $old_value The old option value. |
| 481 | * @param mixed $value The new option value. |
| 482 | */ |
| 483 | do_action( 'update_option', $option, $old_value, $value ); |
| 484 | |
| 485 | $update_args = array( |
| 486 | 'option_value' => $serialized_value, |
| 487 | ); |
| 488 | |
| 489 | if ( null !== $autoload ) { |
| 490 | $update_args['autoload'] = ( 'no' === $autoload || false === $autoload ) ? 'no' : 'yes'; |
| 491 | } |
| 492 | |