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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 |
|---|---|
| 323 | /** |
| 324 | * Fires immediately before an option value is updated. |
| 325 | * |
| 326 | * @since 2.9.0 |
| 327 | * |
| 328 | * @param string $option Name of the option to update. |
| 329 | * @param mixed $old_value The old option value. |
| 330 | * @param mixed $value The new option value. |
| 331 | */ |
| 332 | do_action( 'update_option', $option, $old_value, $value ); |
| 333 | |
| 334 | $update_args = array( |
| 335 | 'option_value' => $serialized_value, |
| 336 | ); |
| 337 | |
| 338 | if ( null !== $autoload ) { |
| 339 | $update_args['autoload'] = ( 'no' === $autoload || false === $autoload ) ? 'no' : 'yes'; |
| 340 | } |
| 341 | |