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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 |
|---|---|
| 466 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 467 | * |
| 468 | * @since 2.0.1 |
| 469 | * @since 4.4.0 The `$option` parameter was added. |
| 470 | * |
| 471 | * @param mixed $old_value The old option value. |
| 472 | * @param mixed $value The new option value. |
| 473 | * @param string $option Option name. |
| 474 | */ |
| 475 | do_action( "update_option_{$option}", $old_value, $value, $option ); |
| 476 | |
| 477 | /** |
| 478 | * Fires after the value of an option has been successfully updated. |
| 479 | * |
| 480 | * @since 2.9.0 |
| 481 | * |
| 482 | * @param string $option Name of the updated option. |
| 483 | * @param mixed $old_value The old option value. |
| 484 | * @param mixed $value The new option value. |