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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 |
|---|---|
| 1231 | * @param mixed $pre_option The value to return instead of the option value. This differs from |
| 1232 | * `$default`, which is used as the fallback value in the event the |
| 1233 | * option doesn't exist elsewhere in get_network_option(). Default |
| 1234 | * is false (to skip past the short-circuit). |
| 1235 | * @param string $option Option name. |
| 1236 | * @param int $network_id ID of the network. |
| 1237 | * @param mixed $default The fallback value to return if the option does not exist. |
| 1238 | * Default is false. |
| 1239 | */ |
| 1240 | $pre = apply_filters( "pre_site_option_{$option}", false, $option, $network_id, $default ); |
| 1241 | |
| 1242 | if ( false !== $pre ) { |
| 1243 | return $pre; |
| 1244 | } |
| 1245 | |
| 1246 | // prevent non-existent options from triggering multiple queries |
| 1247 | $notoptions_key = "$network_id:notoptions"; |
| 1248 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |
| 1249 | |