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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 |
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465 | /** |
466 | * Filters an option before its value is (maybe) serialized and updated. |
467 | * |
468 | * @since 3.9.0 |
469 | * |
470 | * @param mixed $value The new, unserialized option value. |
471 | * @param string $option Name of the option. |
472 | * @param mixed $old_value The old option value. |
473 | */ |
474 | $value = apply_filters( 'pre_update_option', $value, $option, $old_value ); |
475 |
|
476 | /* |
477 | * If the new and old values are the same, no need to update. |
478 | * |
479 | * Unserialized values will be adequate in most cases. If the unserialized |
480 | * data differs, the (maybe) serialized data is checked to avoid |
481 | * unnecessary database calls for otherwise identical object instances. |
482 | * |
483 | * See https://core.trac.wordpress.org/ticket/38903 |