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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 |
|---|---|
| 298 | /** |
| 299 | * Fires immediately before an option value is updated. |
| 300 | * |
| 301 | * @since 2.9.0 |
| 302 | * |
| 303 | * @param string $option Name of the option to update. |
| 304 | * @param mixed $old_value The old option value. |
| 305 | * @param mixed $value The new option value. |
| 306 | */ |
| 307 | do_action( 'update_option', $option, $old_value, $value ); |
| 308 | |
| 309 | $update_args = array( |
| 310 | 'option_value' => $serialized_value, |
| 311 | ); |
| 312 | |
| 313 | if ( null !== $autoload ) { |
| 314 | $update_args['autoload'] = ( 'no' === $autoload || false === $autoload ) ? 'no' : 'yes'; |
| 315 | } |
| 316 | |