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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 |
|---|---|
| 2029 | * @param mixed $pre_site_option The value to return instead of the option value. This differs from |
| 2030 | * `$default_value`, which is used as the fallback value in the event |
| 2031 | * the option doesn't exist elsewhere in get_network_option(). |
| 2032 | * Default false (to skip past the short-circuit). |
| 2033 | * @param string $option Option name. |
| 2034 | * @param int $network_id ID of the network. |
| 2035 | * @param mixed $default_value The fallback value to return if the option does not exist. |
| 2036 | * Default false. |
| 2037 | */ |
| 2038 | $pre = apply_filters( "pre_site_option_{$option}", false, $option, $network_id, $default_value ); |
| 2039 | |
| 2040 | if ( false !== $pre ) { |
| 2041 | return $pre; |
| 2042 | } |
| 2043 | |
| 2044 | // Prevent non-existent options from triggering multiple queries. |
| 2045 | $notoptions_key = "$network_id:notoptions"; |
| 2046 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |
| 2047 | |