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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 |
|---|---|
| 1401 | * @param mixed $pre_option The value to return instead of the option value. This differs |
| 1402 | * from `$default`, which is used as the fallback value in the event |
| 1403 | * the option doesn't exist elsewhere in get_network_option(). |
| 1404 | * Default false (to skip past the short-circuit). |
| 1405 | * @param string $option Option name. |
| 1406 | * @param int $network_id ID of the network. |
| 1407 | * @param mixed $default The fallback value to return if the option does not exist. |
| 1408 | * Default false. |
| 1409 | */ |
| 1410 | $pre = apply_filters( "pre_site_option_{$option}", false, $option, $network_id, $default ); |
| 1411 | |
| 1412 | if ( false !== $pre ) { |
| 1413 | return $pre; |
| 1414 | } |
| 1415 | |
| 1416 | // Prevent non-existent options from triggering multiple queries. |
| 1417 | $notoptions_key = "$network_id:notoptions"; |
| 1418 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |
| 1419 | |