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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 |
|---|---|
| 438 | /** |
| 439 | * Filters an option before its value is (maybe) serialized and updated. |
| 440 | * |
| 441 | * @since 3.9.0 |
| 442 | * |
| 443 | * @param mixed $value The new, unserialized option value. |
| 444 | * @param string $option Name of the option. |
| 445 | * @param mixed $old_value The old option value. |
| 446 | */ |
| 447 | $value = apply_filters( 'pre_update_option', $value, $option, $old_value ); |
| 448 | |
| 449 | /* |
| 450 | * If the new and old values are the same, no need to update. |
| 451 | * |
| 452 | * Unserialized values will be adequate in most cases. If the unserialized |
| 453 | * data differs, the (maybe) serialized data is checked to avoid |
| 454 | * unnecessary database calls for otherwise identical object instances. |
| 455 | * |
| 456 | * See https://core.trac.wordpress.org/ticket/38903 |